Rewrite the sentences using the -ing form.
1 It's good to swim.
2 It's difficult to drive a lorry.
3 It's important to laugh a lot.
4 It's interesting to study history.
Complete the second sentence so that it means the same as the first.
1 Alice sings very well. - Alice is good at_
2 I'd like to buy that phone. - I'm interested in_
3 I can't type very fast. - I'm slow at_
4 She may arrive late. - She's worried. - She's worried about_
1 swimming.
2 driving.
3 laughing.
4 studying.
1 singing.
2 buying.
3 typing.
4 arriving.