Find the mistakes and correct them:
- He are a doctor.
- They is playing in the park.
- I am late yesterday.
- She being very happy right now.
- We been to the museum last weekend.
Explanations for corrections:
- 
He are a doctor → He is a doctor. - “He” is singular, so it should be paired with “is,” not “are.”
 
- 
They is playing in the park → They are playing in the park. - “They” is plural, so it should be paired with “are,” not “is.”
 
- 
I am late yesterday → I was late yesterday. - “Yesterday” indicates the past, so use “was,” not “am.”
 
- 
She being very happy right now → She is being very happy right now. - The verb “being” requires a helping verb (“is”) to complete the sentence.
 
- 
We been to the museum last weekend → We were at the museum last weekend. OR We have been to the museum. - “Been” needs a helping verb (“have” or “had”) in the correct tense.