Think thought thought
come came come
find found found
give gave given
see saw seen
present simple - констатация факта. обычное действие, повторяющееся регулярно.
i - am, do. he, she, it - is, does.
you, we, they - are, do.
yesterday, 2 hours ago, last week/month/year, eventually, long ago etc.
i, you, we, they - don't
he, she, it - doesn't
do i, you, we, they?
does he, she it?