If it will rain意思

"If it will rain" is a sentence that uses the future tense of the verb "rain" ("will rain") to express a condition or possibility. However, this sentence structure is not grammatically correct in standard English. The correct way to express this idea using "will" would be to use the future tense of "rain" as an auxiliary verb, as in:

"If it is going to rain, we should take an umbrella."

This sentence uses "is going to" to express the future possibility of rain. Another correct way to say it would be:

"If it rains, we should take an umbrella."

This sentence uses the present tense of "rain" to express a condition that could happen in the future.