1 You
can borrow my pen if you
do not have/ haven’t got (not + have) one yourself.
2 You will feel sick if you eat (eat) all that candy!
3 If you read this book, you will cry (cry) when you find out the end.
4 You would like this series if you watched (watch) them.
5 If I explained this again you would understand (understand).
6 If you go outside now, you will get (get) a cold.