Malami yana da kwarewa sosai a koyar da Hausa.

You can break it down like this:

• Malami – the subject: teacher
• yana da – verb phrase meaning has / possesses (literally he is with)
• kwarewa sosai – noun phrase: a lot of skill / very much expertise
• a koyar da Hausa – prepositional phrase: in teaching Hausa

So, overall structure is:

Subject + verb phrase + noun phrase + prepositional phrase
→ Malami (subject) yana da (has) kwarewa sosai (a lot of expertise) a koyar da Hausa (in teaching Hausa).

Yana da comes from ya (he) + na (progressive/locative marker) + da (with). Historically it is like saying he is with X, which then developed the meaning he has X.

Usage:

• Yana da kudi – He has money
• Malaminku yana da mota – Your teacher has a car
• Malami yana da kwarewa – The teacher has expertise

So yes, [subject] + (ya/ta/na etc.) + na / yana + da + [thing] is the normal way to express to have (possession or qualities) in the present:

• Ina da littafi – I have a book
• Kana da aiki – You have work
• Yana da kwarewa – He has expertise

For negation, though, the pattern changes (see a later question on negation).

These two mean different things:

• Malami yana da kwarewa

  • Literally: The teacher is with expertise
  • Meaning: The teacher has expertise / is very experienced (a state or quality he already has)

• Malami yana kwarewa

  • Literally: The teacher is becoming skilled / is getting better
  • Meaning: it describes a process of becoming skilled, not an already-established level of expertise.

So:

• To describe an existing, stable quality → yana da kwarewa
• To describe the ongoing process of improving → yana kwarewa

In your sentence, you want to say he already is very experienced, so yana da kwarewa sosai is the correct and natural choice.

Kwarewa is a noun formed from the verb kware (to become skilled, to be excellent at something).

Its meaning covers:

• skill / proficiency
• expertise / competence
• practical experience (in the sense of having mastered something)

In English, depending on context, it can be translated as:

• skill: kwarewa a rubutu – skill in writing
• expertise: kwarewa a likitanci – expertise in medicine
• experience (in doing something): yana da kwarewa a koyarwa – he has a lot of experience in teaching

So in your sentence:

kwarewa sosai a koyar da Hausa ≈ a lot of expertise/experience in teaching Hausa.

Sosai is an intensifier meaning:

• very, really, extremely, a lot.

In your sentence:

• kwarewa sosai – very great expertise / a lot of expertise

Typical positions:

• After adjectives or nouns of quality:
  
  • gwaninta sosai – great skill
  • wahala sosai – a lot of trouble
• After verbs (especially stative or feeling verbs):
  
  • Ina son Hausa sosai – I really like Hausa

In your example, the most natural place is immediately after kwarewa:

• Malami yana da kwarewa sosai a koyar da Hausa.

You might occasionally hear Malami yana da kwarewa a koyar da Hausa sosai, but putting sosai right after kwarewa is clearer and more standard here.

The preposition a in Hausa is very broad. Among its uses are:

• in, at, on (location)
• in (a field, area, or domain)

Here, a introduces the domain in which the person is skilled:

• kwarewa a koyar da Hausa – expertise in teaching Hausa
• kwarewa a lissafi – skill in mathematics
• kwarewa a girki – skill in cooking

So in this sentence, a is best understood as in, marking the field where the teacher has expertise.

The verb family looks like this:

• koya – to learn; also, in some constructions, to teach
• koyar da – to teach (literally “cause to learn something”)
• koyarwa – teaching (as a noun: the activity/profession of teaching)

The construction koyar da [object] is the normal way to say to teach [something]:

• koyar da Hausa – to teach Hausa
• koyar da yara – to teach children
• koyar da lissafi – to teach math

Function of da here:

• It links koyar (teach) with its object, similar to teach with / teach X.
• Many Hausa causative/“make do” verbs use da to introduce what is being affected.

So a koyar da Hausa = in teaching Hausa (using the verb phrase koyar da in a kind of verbal-noun role).

Malami by itself can mean a teacher or the teacher, depending entirely on context. Hausa usually does not use separate words like a or the.

Definiteness is understood from:

• The situation (shared knowledge):
  
  • In a story where only one teacher has been mentioned, Malami likely means the teacher.
• Additional modifiers:
  
  • Malamin nan – this teacher / that teacher
  • Malaminmu – our teacher

So in isolation:

• Malami yana da kwarewa sosai a koyar da Hausa.
  could be interpreted as
  
  • A teacher is very experienced in teaching Hausa (generic / some teacher)
    or
  • The teacher is very experienced in teaching Hausa (if already known which teacher you mean).

Yes, the progressive/possession forms agree in gender and person. For 3rd person singular:

• yana – he is / it is (masc. / general)
• tana – she is / it is (fem.)

So:

• Malami yana da kwarewa sosai a koyar da Hausa.
  – The male teacher is very experienced in teaching Hausa.

For a female teacher, you normally change the noun and the verb:

• Malama tana da kwarewa sosai a koyar da Hausa.
  – The female teacher is very experienced in teaching Hausa.

Summary:

• Masculine: Malami yana da …
• Feminine: Malama tana da …

For the verb to have with da, the usual negative pattern is:

• ba [pronoun] da [thing]

Examples:

• Ba ni da kudi. – I do not have money.
• Ba shi da mota. – He does not have a car.

For your sentence:

• Positive: Malami yana da kwarewa sosai a koyar da Hausa.
• Negative (natural form):
  
  • Malami ba shi da kwarewa sosai a koyar da Hausa.

Literal structure:

• Malami – the teacher
• ba shi da – does not have
• kwarewa sosai a koyar da Hausa – much expertise in teaching Hausa

The original order is the clearest and most natural:

• Malami yana da kwarewa sosai a koyar da Hausa.

Variations:

1. Moving sosai:

   • Malami yana da kwarewa a koyar da Hausa sosai.
     – Possible in speech, but can sound slightly less focused. It may be heard as stressing the activity (in teaching Hausa very much) rather than the amount of expertise.

2. Fronting a koyar da Hausa for emphasis:

   • A koyar da Hausa, malami yana da kwarewa sosai.
     – In teaching Hausa, the teacher is very experienced.
     – This is fine when you want to highlight the domain first.

For a neutral, default sentence stating a fact about the teacher’s abilities, the original:

• Malami yana da kwarewa sosai a koyar da Hausa.

is the best and most typical order.