A six letter word

What English six letter word has its last three letters as the past tense of its first three letters? Check the answer here.

A word of three letters

I am a word of three letters. I am spelt the same backward and forward; turn me upside down, I will become your mother. What am I? Check the answer here.

I am pronounced as one letter

I am pronounced as one letter, written with three. I come in blue, black, brown, or grey. Reverse me and I read the same either way. What am I? Check the answer here.