ing or infinitive

My baby brother is one year old and he's learning ... on his own.

• walk

• to walk

• walking

He used ... the room with his friend at the University.

• to share

• share

• sharing

Yesterday I helped my sister ... her maths homework.

• to do

• do

• doing

Please, tell me when you're ready ... .

• to start

• start

• starting

Frank promised ... me tomorrow.

• to call

• call

• calling

We really enjoy ... in the mountains.

• to hike

• hike

• hiking

Would you like ... me in the kitchen?

• to help

• help

• helping

Thank you for ... patiently.

• to wait

• wait

• waiting

Tom keeps ... loudly in class.

• to talk

• talk

• talking

Are your parents interested in ...?

• to garden

• garden

• gardening