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Correct the verb
I be sorry I can't come
...............................................................................................
Nader and his wife writes poor English
..............................................................................................
I be sorry I can't come
the answer is = am
verb to be is used as follows
I am
we/ they are
she- he- it is
Nader and his wife writes poor English
write
Nader and his wife= they
If the subject is plural, then you don't add s to the verb.
We say
I - we- they write
but= he- she writes
Good luck