Factual conditionals: simple present or future?

At times I find it difficult to decide whether to use a zero conditional sentence or a first conditional. Would you mind helping me with the following example:

If they want to get there fast, they ……. (take/will take) the
express train.

Thanks!

Answer

It depends on whether you are talking about an habitual event or predicting a future event.

If they want to get there fast, they take the express train.

In this case, taking the express is an habitual consequence of needing to get there fast. If can be replaced by whenever.

On the other hand, if you are speculating on how they will get somewhere in the future, then you say:

If they want to get there fast, they will take the express train.

In this case, if cannot be replaced by whenever, and will cannot be omitted.

Attribution
Source : Link , Question Author : Mori , Answer Author : Shoe

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