Hello there, plz help me with the sentence. which sentence is correct? The last ten years 'have witnessed' great changes in our city. The last ten years 'has witnessed' great changes in our city. have witnessed ？ or has witnessed?

Hello there, please help me with the question. What does the ＂it＂ mean, when we say " worth it". For example, " I'm finally back home now, feeling really tired, but celebrating Naadam with my friend was totally worth it. " What does the " it " mean,when it is used after the worth?

Hello there! Please help me with this question. Are the two sentences both correct in grammar? 1. It is the first time I visit this city. 2. It is the first time I 've visited this city. And what is the difference between the two sentences above? Must the present perfect tense be used in the sentence structure " It is the first time that……?

About causative words Hello there! Please help me. I have a very complicated question. Why when we use " let, have,make",we can say let/have/make sb do sth. While when we use " force" or "get", we should say get sb to do, force sb to do, why?

Hello there! Please help me with the question 7 and question8. Question7， the answer is " As", but can I also use " When"? Question8，the answer is " using", if I say, " … they also express their feelings 'by' using unspoken language " ( If I add the 'by' in front of the 'using', is it also correct ? or is the meaning also the same?)

Hello there, please help me with the meaning of " out of " in this sentence. What does the " out of " mean in this sentence. "You will be able to get a lot more interesting conversation out of whomever it is you are talking to."

Please help me with the question 7. I know here should be " to overcome", but can I use " overcoming " here? When I use " …the determination overcoming", is it incorrect?

Please help me with the sentence: Why they say " fall in love at first sight" insead of " fall in love at the first sight"?