Zero, First, Second Conditional. Вставьте слова из скобок в правильной форме. Первое предложение — пример.
If you want (want) to see the stars and planets, you (can) make your own telescope. All you need is a cardboard tube – the ones you (use) if you want to send a poster by mail – and a couple of lenses. Make sure you cut the tube very straight. This is important, as you (not be able to) change the focus unless it (be) absolutely straight. Then attach the lenses inside the tube. You can just slide them in, but if you (need) to make them secure, glue them in carefully. Finally, cover the other end of the tube with card and make a small hole in the end to look through. Now you're ready to look at the stars! It's not the world's most powerful telescope, but if you (use) it on a clear night, you get some good views. If I (not have) mine, I wouldn't see so much of the night sky.

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