Question

it is difficult ( )(learn)english he often helo me ( )(learn)english let me ( )(help)you

please ( )(take)this book to the classroom
thanksfor( )(help)me
it's great( )(have)english every day
( )get to work,he gets up early
can you ( ) (call)him ( )(tell)him ( )(call)me?i wish ( )(answer)his phone,and i'm busy( )(work)now. 非谓语动词

Answer 1

please ( )(take)this book to the classroom
thanksfor( )(helping)me
it's great( to)(have)english every day
( to)get to work,he gets up early
can you ( ) (call)him ( to)(tell)him ( )(call)me?i wish ( )(answer)his phone,and i'm busy( working)(work)now. 非谓语动词

Answer 2

it is difficult ( to learn)(learn)english
he often help me ( learning)(learn)english
let me ( help)(help)you
please (take )(take)this book to the classroom
thanks for( helping)(help)me
it's great(to have )(have)english every day
( Getting)get to work,he gets up early
can you (call ) (call)him ( to)(tell)him (to )(call)me?i wish ( to answer)(answer)his phone,and i'm busy(working )(work)now.

追问

谢了，但是为什么

追答

基本上都是固定的用法
非谓语动词是指在句子中假如已经有了一个谓语动词，那其它的动词要作某种变形，或变成不定式（to do），或变成分词形式（现在分词或过去分词），具体用什么，要看谓语动词本身或看句子的结构，比如it is difficult to learn english ，这里 to learn English是充当真正的主语，it是形式主语。
主语或宾语，一般都只能用名词性短语来充当，像thanks for helping...，helping这个现在分词结构是充当宾语
Getting to work,he gets up early这个句子里 getting to work 是现在分词短语充当原因状语，意思是：为了上班，他很早就起来了。

但有些词比如：let , have, make，叫使役动词，后面跟的动词是原形，相当于一个省略了to的不定式，这里let me help you就是这个用法

Answer 3

to learn;(to) learn; help
take
helping
to have
To
call;to tell;to call;
to answer ;(in) working

Answer 4

to learn ;in learning; help
take
helping
to have
for
call;and tell;to call
to answer;at working