is it correct grammaticaly to say : i think he was absent ?
Grammatically it's fine if you are not certain that he was absent. You only say "I think ..." if you are not 100% sure.
I think he was sick yesterday.
I think he is absent.
I think my television is broken.
Please see the amendments I made in red. In written English:
- Start every sentence with a capital letter.
- Always capitalise the word "I".
- End every sentence with the appropriate punctuation mark (full stop, exclamation mark, question mark).
- Do not put a space before a comma, a full stop, a question mark or an exclamation mark, but always put a space after them.