I have changed your thread title. The title should include some/all of the words/phrases you are asking us about. Titles like "grammar checking" are no good.
a. I am old. Am I old?
b. It is Saturday. Is it Saturday?
c. Orchids are beautiful. Are orchids beautiful?
d. They are singing. Are they singing?
e. I eat apples. Do I eat apples?
f. She spoke French. Did she speak French?
g. They have left. Have they left?
h. She wants to choose a new hat. Does she want to choose a new hat?
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