Hi !!
Now, change the following statements into Yes/No questions,
A.Sarita is a helpful girl.
Is Sarita a helpful girl ?
B. You are coming to school.
Are you coming to school ?
C. They are happy.
Are they happy ?
D .The students are looking smart in their school uniforms.
Are the students looking smart in their school uniforms ?
E. I may come inside.
May I come inside ?
F. It is all right.
Is it all right ?
G. He eats an apple everyday.
Does she eat an apple every day ?
H. She gave me a book yesterday.
Did she give me a book yesterday ?
I. They have a car.
Do they have a car ?
Questions that have either “yes” or “no” for an answer are formed using auxiliary verbs at the beginning of the sentence, except when "be" is the verb; as it's an auxiliairy nothing changes.
for others verbs than "be", you must use "do" as an auxilairy to form the question (or negation)
present = do/ does if 3rd p. sing.
past = did
as the auxiliairy is conjugated the verb stays at its base
do/does + subject + base verb + ? > simple present
did + subject + base verb + ? > past simple
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I'm not a native english speaker that's why my words might sound weird sometimes when I try to explain something.
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hope this helps :)