verb+ing form or verb + to- infinitive

spend

spending

to spend

to spending

to buy

buy

buying

to buying

get

getting

to getting

to get

to wear

wear

wearing

to wearing

go

to go

going

to going

thinking

to think

think

to thinking

read

reading

to reading

to read

to listening

listen

listening

to listen

go

going

to go

goiing

needed

to need

needing

to needing

wear

to wear

wearing

to wearing

helping

help

to help

to helping