From "Advanced Grammar in Use, Chapetr 11" We can use will or going to with little difference in meaning in the main clause of an if-sentence when we say that something is conditional on something else-it will happen if something else happens first: 1- If we go on like this, we'll/we're going to lose all our money. 2- You'll/You're going to knock that glass over if you're not more carefully. However, we use will(or another auxiliary), not going to, when we describe a future event that follows another. Ofetn "if" has a meaning similar to "when" in this kind of sentene. 1-If you look carefully, you'll find writing scratched on the glass. 2-If you move to your left, you'll be able to the church. = I don't like his explanation. I need...
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