Do Americans use the phrase "club together"? I've heard it a couple of times in British English in the meaning of sharing the cost of something. For example, we clubbed together to buy her a nice birthday present. How about American English or other varieties of English? Do you use this expression there? If not, what would you say in this situation?

Is it correct to say "last class/last vacation" ? I know you can say "during the last vacation/on the last vacation" and "in the last class". But does it work without any preposition in the following examples? Last class, we talked about the Present Perfect. Last vacation, I visited Canada.

这句中文怎么说？ I have recorded two videos today.

Are all the three variants grammatically correct? I need to take some time off and go travelling. I need to take time off and go travelling. I need to take a time off and go travelling. I personally prefer the first variant since it sounds natural and grammatical to me. The second sentence seems to be grammatical but not that natural. As for the third option, the "a" seems to be wrong here (from a grammatical point of view). However, I've searched for "take a time off" on Google and there were millions of results.

Should I use the article "a" here? There are two strategies that I use to build up a vocabulary in a foreign language. There are two strategies that I use to build up vocabulary in a foreign language. I've noticed that when you have an adjective before "vocabulary", you have to use "a", for example, "a wide vocabulary/ a limited vocabulary". But what about the sentences above? Is it correct to use "a" there or is it better to omit it?

Can I omit the second auxiliary here? Ich bin früh aufgewacht und habe viel gearbeitet. Can I omit "habe" here or should I keep it because the verbs "aufwachen" and "arbeiten" require different auxiliaries? And what about a sentence where both verbs require the same auxiliary? Ich habe viel geschlafen und gearbeitet. Is it okay not to repeat the second "habe"?

What word or phrase should I use? What word or phrase should I use to refer to a process of making your body get used to the cold in order to boost your immunity? It's quite common in Russia and we have a special verb for it. People usually swim in cold water or walk on the snow so they get more healthy and resistant.

Welcher der beiden Sätze ist richtig? Ich habe euch noch nie streiten gesehen. Ich habe euch noch nie streiten sehen.

Is the following sentence grammatically correct? "There is nothing firm yet, the new train timetable is being worked out. However, it is clear that it will be as comfortable an electric train, only in the night-time format". I'm particularly confused about the comparison here (as comfortable an electric train), since the second component is omitted.