Simple Present,
Simple Past,
Simple Future,
Present progressive,
Past progressive,
Present perfect,
Past perfect,
Future perfect,
Present intensive,
Past Intensive,
Imperative,
| Verb: knock down ___ | Past Participle: knocked down ___ | Gerund: knocking down ___ |
knock down: Present perfect
| [I] I have knocked down ___ |
| [you, we, they] You have knocked down ___ |
| [he, she, it] He has knockedv |
The old building is being knocked down.
 |
All of the English activities with description in Arabic, 汉语, English, Français, Deutsch, Indonesian, Italiano, 日本語, Portuguêes, Русский, Español,