to be exercises
1. http://grammar-tei.com/uprazhneniya-na-otrabotku-glagola-to-be-exercises-verb-to-be/
2. https://english4real.com/grammar-exercises-el-be.html
1. http://grammar-tei.com/uprazhneniya-na-otrabotku-glagola-to-be-exercises-verb-to-be/
2. https://english4real.com/grammar-exercises-el-be.html
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