she said, "i am very happy to help you."→
she said that she was very happy to help you.
2. 直接引语是一般(选择/反意)疑问句，变成间接引语时，由连词whether或if 引导。例如：
he asked me, "do you like playing football?"→
he asked me if/whether i liked playing football.
注意：大多数情况下，if和whether 可以互换，但后有or not,或在动词不定式前，或放在介词后作连接词时，一般只用whether。例如：
she asked me whether he could do it or not.
he hesitated about whether to drive or take the train.
3. 直接引语是特殊疑问句，变成间接引语时，由相应的疑问词who, whom, whose, how, when, why, where 等引导。例如：
my sister asked me, "how do you like the film?"→
my sister asked me how i liked the film.
4. 直接引语是祈使句，变成间接引语时，把动词原形变成动词不定式，并在动词不定前加tell, ask, order 等的宾语。例如：
the captain ordered, "be quiet."→
the captain ordered us to be quiet.
my teacher asked me, "don't laugh."→
my teacher asked me not to laugh.
they told their son,"the earth goes round the sun."→
they told their son that the earth goes round the sun.
(2)直接引语变间接引语时， 指示代词、时间状语、地点状语等要作相应的变化。如：this/that→ these/those, now→then, today→that day, yesterday→the day before, last year→the year before, ago→before, here→there等。例如：
he said, "i haven't seen her today."→
he said that he hadn't seen her that day.
he asked lucy, "where did you go?"→
he asked lucy where she went.
tom said, "what do you want, ann?"→
tom asked ann what she wanted.