Complete the sentences with an infinitive, a bare infinitive, or a gerund.

Choose the correct option.

I'm OK with [look|to look|looking] after my sister at the weekends.

Keira listened to Billie Eilish [sing|to sing|singing] her favourite song.

[Begin|To begin|Beginning] with, I would rather watch a horror movie.

Thomas saw a volcano [erupt|to erupt|erupting] and then calm down.

It was so kind of you [help|to help|helping] us after the earthquake.

I need Moira to help me [do|to doing|doing] this maths project.

Mr Richardson was seen [leave|to leave|leaving] his house secretly.

What do you think about the new smartphone? Is it really worth [buy|to buy|buying]?