For my Chinese language class, I need to go through this practice worksheet and fill out which uses of 了 are correct. However, while I think I know decently when to use 了， I am not sure about some of my answers, as we have not discussed some things in class.
| 我们现在一起吃饭了。 | I'm not sure about this one. I think it might be correct because it could say "Now we can eat," which uses 了 to indicate a change.
| | 我明天要跟你去健身房了。 | I don't think this one is correct because it uses 明天 and 要which indicates it will happen in the future. |
| 我已经吃了午饭。 | I think this one is correct, it says "I already ate lunch." |
| 我看电影了。 | This one seems correct, "I watched TV." |
| 她穿新的裙子了 | This one also seems to use 了correctly, it says "She wore a new skirt." | | 我去了中文课了。 | Again, this one also seems to use 了 correctly, I believe it translates to "I have been going to Chinese class." | | 他会说中文了。 | This one also seems correct. "He can now speak Chinese." |
| 你真的买了两个新的电视吗？ | I also think this is correct, because the 了 occurs before the numbers and indicates a the past tense of 买。 “Did you really buy two televisions?" |
| 他买四本书了 | This one isn't correct because 了occurs after the quantity and not before the quantity and after the verb like it should. |
| 你们回家了 | I think this one is correct, it translates to "You have returned home." |