例： could you tell me where the post office is??
could you tell me what he said? (what作said的宾语)
例： they said that they would give me some help. (that 仅作引导词)
例： he asked when we would leave home.
例：i will come when i am free.?
i'm late because my bike is broken.?
he went so early that he got a good seat.?
she studied hard so that she would pass the exam.
例： if it rains tomorrow i shall not go to the cinema.
例： when i'm reading a book?
例： she can swim across the river， can't she??
it's a fine day， isn't it??
marry needs to have a rest， doesn't she??
you have nothing to do， do you??
he seldom does homework， does he??
don't open the door， will you??
open the door please， will you??
let us have a rest， will you??
let's go， shall we?
例.what a hot day it is!?
how hot the weather is!