failure in (an exam) (n)
faithful to (adj)
familiar to sb (adj)
familiar with (adj)
famous for (adj)
fed up with (adj)
fill sth with sth else (v)
fond of (adj)
forget about sth (v)
forgive sb for (v)
friendly with/to (adj)
frightened of (adj)
full of (adj)
furious with sb about/at sth (adj)