It's time to get up.Wake him up,please.
It's time for us to do extra-curricular activities.
It's good for our eyes to do eye exercises.
Tom is a good swimming player.He spends half an hour (in) swimming every day.
My net freinds (e-friends) often send email to me.
Her grandfather does exercises for half an hour every day.=Her grandfather spends half an hour in doing exercises every day.
How much time do you spend in playing the piano?
I often spend much money on books.= It often costs me much money to buy books.
Tom spends two hours in practicing speaking Chinese every day.