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Know and Tenses

Beginners
English exercise "Know and Tenses" created by greg100 with The test builder
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1. They are my friends. We've knowknewknown each other for years.
2. You won't knowknewknowing how good this cake is till you have tasted it.
3. I didn't knowsknowknew who he was. I had never seen him before.
4. His wife knownknowknows how to cook a tasty dinner. She is a good cook.
5. Smoking cigarettes is knowsknowingknown to cause lung cancer. Give up smoking.
6. You knowknewknown about his problems and you never told me.
7. If I had knowingknewknown about their problems I would have helped them.
8. There is no knewknowingknow what the future will give them.
9. She knowsknownknow all about the latest fashion trends.
10. I knowknewknows his father and mother when I was in high school, but I lost touch with them.
11. Do you knowknewknowing that Susan and Patrick are getting married?
12. Sheila knowsknewknows where Roger was but she didn't tell.
13. I wonder if she knowingknowknows how much the shoes cost.
14. She would like to be as well-knowknowsknown as Lady Gaga.
15. KnowKnowingKnew Steve as I do, he wouldn't do that. Leave him alone, will you?