Hello. I'll be very grateful for your help.

1)Is it possible to use "involve" in the context "This step could involve a serious crisis"?
2)Is it possible to use "till the present day" the same as "until now", for example "Till the present day, China has opposed tough sactions on Syria"?
3)Are the sentences correct a)It is a crisis at the same level as Greece b) It is a crisis at the same level as in Greece" c) It is a crisis at the same level as that in Greece d)It is a crisis at the same level as the one in Greece.
THANK YOU.

1. This would make more sense if you wrote, "This step could result in a serious crisis."

2. Yes.

3. c and d are the best written of the 4.

Hello! I'd be happy to help you with your questions.

1) Yes, it is possible to use "involve" in the context "This step could involve a serious crisis." In this sentence, "involve" is used to indicate that a serious crisis may be a part of the process or result of the step being discussed.

2) Yes, "till the present day" can be used in the same way as "until now". For example, "Till the present day, China has opposed tough sanctions on Syria" means the same as "Until now, China has opposed tough sanctions on Syria". Both phrases convey the idea of something continuing up to the current time.

3) Out of the given options, sentence d) "It is a crisis at the same level as the one in Greece" is the most correct. This sentence compares the crisis being discussed to a specific crisis in Greece. It specifies that the level of the crisis being referred to is the same as the level of the crisis in Greece.

I hope that clarifies your questions. Let me know if there's anything else I can help you with!