Sic et panis e clibano et cantus in atrio omnibus gratissimi sunt.

In this sentence, et ... et ... means both ... and ....

So:

• et panis e clibano
• et cantus in atrio

together mean both bread from the oven and song/singing in the courtyard.

A learner might first read each et simply as and, but the pair works as a set here.

Sunt is plural because the sentence has a compound subject:

• panis = bread
• cantus = song / singing

Since there are two things being talked about together, Latin uses the plural verb sunt = are.

If there were only one subject, you would expect est instead.

Both panis and cantus are nominative singular, and together they form the subject.

• panis is a 3rd-declension noun
• cantus is a 4th-declension noun

Even though each noun is singular by itself, they are joined together, so they function as a plural idea: bread ... and singing ... are.

A useful point for learners: cantus can look a little tricky, but here it is nominative singular, not plural.

Gratissimi agrees with the subject, so it must match panis et cantus.

Because the subject is:

• plural in sense: two things are being described
• masculine: both panis and cantus are masculine

the predicate adjective becomes gratissimi = masculine nominative plural.

This is a normal Latin agreement pattern: adjectives agree with the nouns they describe in gender, number, and case.

Yes, gratissimi is the superlative form of gratus.

Basic pattern:

• gratus = pleasing / welcome
• gratior = more pleasing
• gratissimus = most pleasing / very pleasing

In context, superlatives in Latin do not always have to sound strictly most in English. Depending on the context, gratissimi sunt can be understood as:

• are most pleasing
• are very pleasing
• are extremely welcome

So even if the meaning shown to the learner uses a smoother English phrase, the Latin form is still a true superlative.

Omnibus is dative plural, meaning to everyone or for everyone.

The adjective gratus and its forms often take the dative of the person who is pleased. So Latin expresses the idea as:

• X is pleasing to someone

rather than the English-style:

• someone likes X

So:

• omnibus gratissimi sunt = they are very pleasing to everyone

This is a very common construction to learn.

The two prepositions are doing different jobs:

• e (or ex) + ablative = out of / from
• in
  • ablative = in / on for location

So:

• e clibano = from the oven
• in atrio = in the courtyard

Also, in with the ablative shows position, not motion. If there were motion into the courtyard, Latin would normally use in with the accusative instead.

Sic usually means thus, so, or in this way.

Here it works as a sentence adverb, probably connecting this statement with something before it. It can give the sense of:

• thus
• in the same way
• likewise
• so

A learner should notice that sic does not belong only to one word; it helps frame the whole statement.

Latin word order is much more flexible than English word order because Latin uses endings to show grammatical relationships.

In this sentence, the endings tell you what each word is doing:

• panis and cantus are the subject
• omnibus is dative
• gratissimi describes the subject
• sunt is the verb

So Latin can place words for emphasis or style rather than relying mainly on position.

A very literal English order might be something like:

• Thus both bread from the oven and singing in the courtyard are very pleasing to everyone.

But Latin does not need to line words up that way to remain clear.

Latin has no definite or indefinite article.

So:

• panis can mean bread, a bread, or the bread
• clibano can mean an oven or the oven
• atrio can mean a courtyard or the courtyard

English has to choose an article, but Latin usually leaves that to context. That is completely normal.

Either can be possible, depending on context.

Cantus can mean:

• song
• singing
• chant
• music/songfulness, in some contexts

So cantus in atrio could be understood as:

• song in the courtyard
• singing in the courtyard

A learner should not assume there is always only one perfect English equivalent. Latin words often cover a range that English divides up differently.