1

I've recently asked the question on Quora which sentence is correct

He could do it if he wanted to

or

He could do it if he wants to

and got answered that the first one is correct and the second one isn't. I would like to get some explanation of why the second one isn't correct. What part of grammar does it violate?
I thought the

He could do it if he wanted to

would refer to the past and

He could do it if he wants to

would refer to the future possible action.

  • The first is correct, the second is perhaps "He can do if he wants to". – Weather Vane Aug 24 '18 at 22:46
2

In grammatical terms, both statements are correct. Which one you might prefer depends on the context and what you want to say or to imply. Take a typical situation in which a promising athlete is not training hard enough to win a race. Then you are more likely to remark to your friend:

He could do it if he wanted to.

The implication is that he does not want to put in the effort.

On the other hand, if you don't know whether the athlete is prepared to train hard, you might say:

He could do it if he wants to.

This leaves open the question of whether the athlete does or does not want to.

Neither of these constructions refers to the past. They both refer to hypothetical situations in the future. But the first implies that the person concerned is unwilling to do what is necessary to achieve the goal although he/she has the potential; the second leaves it open.

An alternative is to say: He can do it if he wants to. It's a more direct way of speaking. He could do it.... is a more guarded or reserved way of saying the same thing. It implies that there's a condition to be met.

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