1. Can you give me a ride if you are driving?

2. Can you give me a ride if you drive?
3. He will be driving, so ask him to give you a ride.
4. He will drive, so ask him to give you a ride.
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Are they all the same in meaning? Which expressions do we have to use? Why do we use 'if you are driving'?

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All are correct. "if you are driving" implies that "you" are driving a car (not driving a golf ball or a nail) in this context. "if you are driving" and "if you drive" mean the same thing.

1. "Can you give me a ride if you are driving?" and 2. "Can you give me a ride if you drive?" are both grammatically correct and have the same general meaning. However, there is a subtle difference in their usage.

In 1, "Can you give me a ride if you are driving?", the speaker is asking if the person can provide a ride at a specific time when they are already driving. This implies that the person being asked will be driving regardless of whether they give the ride or not.

In 2, "Can you give me a ride if you drive?", the speaker is asking if the person can provide a ride in general, whenever they decide to drive. This implies that the person being asked has the choice of driving or not, and the ride will depend on whether they decide to drive or not.

Regarding the use of "if you are driving," it is used to specify a condition or circumstance under which the person can provide a ride. It implies that the person is already in the act of driving, so the speaker is seeking confirmation that they are available to give a ride while in that state.

In summary, both expressions are similar in meaning, but the use of "if you are driving" adds specificity to the timing and suggests that the person will already be driving when the ride is requested.