guess + noun
Can you guess her age?
guess + at + noun
It’s difficult to guess at the figures.
guess + adverb
He had to choose one, and he guessed correctly.
guess + wh- clause
It’s not hard to guess where he went.
guess + clause
He guessed she was at home.
guess + that + clause
He guessed that she was at home.
adjective + to + guess
It’s difficult to guess the outcome.