like: If you can → →
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If you can't nd a hotel for the night, you'll end up sleeping on the street. ☊ 
Nếu cậu không tìm được khách sạn để ngủ buổi đêm, kết quả là cậu sẽ ngủ trên đường. ☊ back sth + adv./prep.: If you can't drive in forwards, try backing it in. ☊ back ☊
If you can only exercise once a week, that's better than nothing (= better than taking no exercise at all). ☊ better ☊
If you can't answer the question, leave a blank. ☊ blank ☊
Please let us know if you cannot attend the meeting. ☊ can ☊
No charge will be made if you cancel within 10 days. ☊ cancel ☊
Listen to the tune and see if you can remember the words. ☊ if ☊
You will lose your deposit if you cancel the order. ☊ lose ☊
I don't mind helping if you can't find anyone else. ☊ mind ☊
I'll invite people if you can organize food and drinks. ☊ organize ☊
Try to avoid losing your temper if at all possible (= if you can). ☊ possible ☊
It's best if you can get someone local to show you the sights. ☊ sight ☊
If you can wait a moment, I'll sort it all out for you. ☊ sort sth/sb/yourself out ☊
I wonder if you can help me. ☊ wonder ☊