To be
She aren't my friend.
She isn't my friend.
He ______ (to play) soccer with his friends.
He plays soccer with his friends.
He don't visit his family.
He doesn't visit his family.
He doesn't walk to work every day.
Right
He are very happy today.
He is very happy today
She _____ (to go) to work by car.
She goes to work by car.
He and she doesn't know the answer.
He and she don't know the answer.
The company doesn't has many clients at the moment
WRONG The company doesn't have many clients at the moment
He am my brother
He is my brother
She ________ (to have) many clients at the bank
She has many clients at the bank
She isn't works every day.
She doesn't work every day.
Ana don't know German
WRONG She doesn't know German