If you help me with this I will be very grateful

4.Note how Prof. Derby expresses his appreciation of Dr. Rensky’s participation in the conference. Study other ways of expressing appreciation.

I appreciate your assistance/advice/frankness/criticism.
It’s very kind of you.
You are very helpful.
That’s/was the right thing to say/to do.
You’ve done a good job.
Good for you.
Well done.
That’s a good idea.
That’s it!

5.React to the following statements using expressions of Task 4:

 I’m going to change the notation. It’s confusing and inconsistent.- That’s it!
 I’ll type the text, you need not bother.- It’s very kind of you. 
 I have managed to do the job. It was not easy.- Good for you. 
 What do you think of my classification? I have worked on it for two years.- You’ve done a good job. 
 I said there was too little time left to spend it on arguing. Was I right?- That was the right thing to say.
 Could I help you with proof-reading? You look tired.- You are very helpful. 
 We are late. Let’s take a taxi.- That’s a good idea.
 I believe he should be told; no point in putting it off.- I appreciate your advice. 
 Let him have the most pay. He worked much more than any of us.- That’s the right thing to do.