It's cool.It's good time to climb hills.中的it和to的不定式个在句中做什么成分

I like music .
My sister likes coffee.
My father likes tea.
I like to swim in the lake this afternoon.
My brother likes to play ball games this evening with some friends.
I like walking in the garden.
My mother likes listening to music after supper.
like to do表一次性将来的动作.
like doing表一贯性经常驻的动作.