I could never be so （）成功的 without your help.
I don't think it's your（)错误.
表示感谢的词组和句型有
A. be very grateful to sb for sth
B. It's all my fault.
C. be much obliged to sb for sth
D. be so thankful to sb for sth
E. I'd appreciate it if...
F. I'm terribly sorry.
G. I owe it to your help.
表示不用谢的句型有：
A. Don't mention it.
B. You are welcome.
C. welcome.
D. Not at all.
E. Forget it.
F. My pleasure.
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