Don't forget ... (lock) the door.
to lock
... (play) scrabble is my favourite hobby.
Playing
He decided ... (go) to New York.
to go
I'd like ... (have) a Porsche.
to have
It's always nice ... (get) chocolates.
to get
He spent four hours ... (study) vocabulary.
studying
They told me how much ... (pay).
to pay
She's going to Australia ... (see) kangaroos.
to see
I'm bored with ... (cook).
cooking
I don't like ... (do) housework.
doing
They are very good at ... (dance).
dancing
Let's try ... (run) faster.
to run
... (ski) is easy.
Skiing
Is he afraid of ... (talk) to people?
talking
It's difficult ... (learn) a new language.
to learn
Please, stop ... (sing)!
singing
I don't know when ... (call) you.
to call