Vincent, you remember that when we use the present tense (he takes care of her) it is something that happens all the time, every day, or very often. The first one is a conditional: if she is sick, he will take care of her. The second one tells you that his wife is sick very often, and when she is sick, he takes care of her.
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Grammar GeekWe don't use the simple present very often.I don't understand what you mean, Barb. I use the simple present quite often myself. I think that statement needs a bit of clarification.