Question

I'm sure it would help if you could say a good word for him.

(如果你能为他说句好话，我相信肯定是有帮助的。)
请高手们分析一下句子成份，if从句是真实条件句吗?谢谢

Answer 1

I'm sure it would help if you could say a good word for him.
I是主语，be sure是谓语，后面的就是宾语，由一个句子构成，这是个宾语从句。
it would help if you could say a good word for him.
是虚拟语气，是对现在时态虚拟，如果你为他说句好话you could say a good word for him，结果是将来的，会起到帮助it would help 。
具体if引导的虚拟语气还有suggest等引导的虚拟语气，可以查看《高考必备》语法中的虚拟语气一章，非常全面，而且很有权威

Answer 2

1. 当if后面接一般现在时的动词时,表示对将来的一种推测.
if sb do sth sb will/shall do sth.
If you go with me, you shall be rewarded.
2. 当if后面接一般过去时的动词时,则是一种虚拟语气.
if sb did sth sb would/should do sth.
If I didn't make that mistake, I would't have suffered such a failure.
3. 当if后面接什么时态都可以时，if为“是否”的意思，句子为宾语从句.
sb do sth if sb do sth.
He said if rain was stop.
由if引导的条件状语从句，时态应该是主将从现，就是说主句用一般将来时，而从句用一般现在时表示将来。
例如 If it doesn't rain tomorrow, I will visit my former school.
这里从句就用一般现在时。
当然if引导的从句也可以用虚拟语气
例如If I got up early in the morning, I wouldn't miss the train.

Answer 3

我相信它会帮助，如果你能为他说好话