英语新手的问题.let me tell the truth.let和TELL都是动词.

只能用let me tell the truth,let 是使役动词,后面只能跟let sb do something.下面附上同类词的用法
使役动词
1.使役动词是表示使、令、让、帮、叫等意义的不完全及物动词,主要有make(使,令),let(让),help(帮助),have(叫)等.
2.使役动词后接受词,再接原形不定词作受词补语.
接宾语时,人称代词用宾格.
He made me(宾格) laugh.
他使我发笑.
I let him go.
我让他走开.
I helped him repair the car.
我帮他修理汽车.
Please have him come here.
请叫他到这里来.
3.使役动词还可以接过去分词作受词补语.
I have my hair cut every month.
我每个月理发.
4.使役动词的被动语态的受词补语用不定词,不用原形不定词.
(主)He made me laugh.
他使我笑了.
(被)I was made to laugh by him.
我被他逗笑了.
使役动词有以下用法：
a.have somebody do sth让某人去做某事
I had him arrange for a car.
b.have somebody doing sth.让某人持续做某事.
He had us laughing all through lunch.
注意：用于否定名时,表示“允许”
i won't have you running around in the house.
我不允许你在家里到处乱跑.
使役性动词（Causative Verb）
1.make /have/ let +sb +do sth.
2.get/set/leave + sb to do/doing sth.