Please help me to correct the following sentences

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. The Bakers is having/ is eating dinner at the moment.
  2. Are there forty classroom at/ in peter’s school?
  3. I usually go swimming in hot day.
  4. You’ re to welcome to bring someone with you to the party.
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2

Hi, here are my suggestions:

The Bakers [are having / are eating] dinner at the moment.
Are there forty [classrooms] at/ in peter’s school?
I usually go swimming [on] hot [days]. {or “on a hot day”.
You’re to welcome to bring someone with you to the party.

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