Моя дочка грається в парку.

In Ukrainian, possessive pronouns agree with the noun they modify in gender, number and case.

• дочка (daughter) is feminine, singular, nominative.
• The base pronoun мій (“my”) changes to моя in the feminine singular nominative.

• грати is a transitive verb meaning “to play (something)”, e.g. грати музику (“to play music”). It usually takes a direct object.
• гратися is the reflexive/intransitive counterpart meaning “to play about; to be playing” with no direct object. It’s especially common when talking about children at play.
• Here, грається (3rd person singular present of гратися) simply means “is playing”.

• парку is the locative singular of the masculine noun парк.
• After the preposition в meaning “in” (to indicate location), Ukrainian uses the locative case.
• For a hard-stem masculine noun like парк, the locative singular ending is -у, giving в парку (“in the park”).

Yes. Both в and у mean “in.” Which form you pick often depends on euphony (ease of pronunciation):

• в is used before most consonants and vowels.
• у is chosen to avoid awkward clusters (for example before б, п, м, в, ф).
  In practice, в парку and у парку are both correct; speakers choose the one that sounds smoother in context.

• Tense: Present
• Person/Number: 3rd person singular (“she/it is …”)
• Aspect: Imperfective (used for ongoing or habitual actions)
  Ukrainian does not have a separate “progressive” tense; the imperfective present covers both simple present and continuous meanings.

Imperfective (focus on the action itself):
• Моя дочка гралася в парку. (“My daughter was playing/used to play in the park.”)

Perfective (focus on the action’s completion):
• Моя дочка погралася в парку. (“My daughter has played around in the park” – implying she finished playing.)

Insert an adverb like зараз (“now”) or саме (“just/at this very moment”). Common placements:
• Моя дочка зараз грається в парку.
• Зараз моя дочка грається в парку.