As far as I know there are two ways to use the simple future tense: we can use either “will” or “be going to”. 

For example:

It will rain tomorrow( it’s going to rain tomorrow)

It could rain tomorrow (it’s possible that it will rain tomorrow)

“It could rain tomorrow” isn’t the simple future tense?

1 Answer 1


It could rain tomorrow.

This isn't simple future tense. "Could" here expresses a possible future.

Similarly, you can use "may":

It may rain tomorrow.

... which is also an expression of possibility, not future simple.

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