Is it present simple tense or complement?

mizansinha007He is my brother. (I know it's a complement sentence.

I don't know what set of terminology you're using to learn English, but I've never heard of a "complement sentence".

CalifJimThis is a sentence with a complement, specifically, a subject complement.

If this is what you meant, mizansinha007, the term is ‘complex-intransitive clause/sentence’.

Thanks, CalifJim. Thanks a lot.... I've got your answer.
Could you please refer me some books that I need to learn English. Actually I am very interested in English.

Aspara Gus the term is ‘complex-intransitive clause/sentence’.

There are days when I just feel old.

fivejedjon Aspara Gus the term is ‘complex-intransitive clause/sentence’.There are days when I just feel old.

There are days when I feel glad I'm normal.

mizansinha007Could you please refer me some books that I need to learn English

Aspara Gus‘complex-intransitive clause/sentence’

That surprises me because "He is my brother" doesn't look the slightest bit complex to me. What feature of that sentence am I missing that makes it complex?

CJ

CalifJimThat surprises me because "He is my brother" doesn't look the slightest bit complex to me. What feature of that sentence am I missing that makes it complex?

I was waiting for you to say that.

Here ya go:

There are days when I feel even older.

Thanks, Still I read "Practical English Usage".
Sir, I'm searching for a book called "A-Z of the English grammar & usage" by Longman(PDF). I heard, It's a very helpful book but I can not get because of not having any 'credit card'. Could you help me please to give me the free link, sir?