I can't always make up my minds on how to appreciate someone's comments. I can't always make up my mind on how to appreciate someone's comments.

I would personally phrase this: "I can't always make up my mind on how to show thanks (/ gratitude/appreciation) for someone's comments."

I can't always make up my minds on how to appreciate someonpeople's comments. I can't always make up my mind on how to appreciate people's comments.

"someone's" sounds like you mean a *specific person* e.g. your mum. "people's comments" sounds like it is *multiple people's* comments you are dealing with

I can't always make up my minds how to appreciate someonSometimes, I don't know what to answer to people's comments. Sometimes, I don't know what to answer to people's comments.

This is closer to what you meant. "appreciate" would mean you don't know how to interpret what someone has said (as a compliment, as a neutral sentence, as a blame etc)

(Would "I don't know what to describesay in response to..." be better? ) (Would "I don't know what to say in response to..." be better? )

with "say", maybe. Both work

I don't have enough vocabulary to express thanksgratitude. I don't have enough vocabulary to express gratitude.

"I'm very grateful" is a very polite way to say thank you :) It is too formal to say to your friends, however

I would be glad if you let me knowshared some good phrases with me. I would be glad if you shared some good phrases with me.

I would be glad if you would let me know some good phrases. I would be glad if you would let me know some good phrases.

need "be" to be there as a verb in this conditional statement. "glad" is an adjective, and you/he/she have to "be" it: I *am* happy -- I would *be* happy The sky *is* grey -- if there were no clouds, it would be blue

I would glad if you could let me know some good phrases. I would glad if you could let me know some good phrases.

I also had a trouble with how to reply when I gottook online English lessons. I also had trouble with how to reply when I took online English lessons.

I also had a trouble with how to reply when I got online English lessons. I also had trouble with how to reply when I got online English lessons.

good sentence

I also had a tsimilar prouble with how to reply when I gotm after taking online English lessons. I also had a similar problem after taking online English lessons.

"trouble" is uncountable, but "problem" is not

HowWhat can I say in response to "Do you have any questions? What can I say in response to "Do you have any questions?

"How can I respond to..." works too. Ask them questions! They're there to help you learn english and there are no stupid questions

HowWhat can I say in response to "Do you have any questions? What can I say in response to "Do you have any questions?

HowWhat can I say in responseanswer to "Do you have any questions?" What can I answer to "Do you have any questions?"

When I replied "Nothing" or "No problem", teachers often looked at me, waiting myfor more words. When I replied "Nothing" or "No problem", teachers often looked at me, waiting for more words.

I tried to modify the sentence to convey the meaning more directly but I might have missed what you were trying to say.

When I replied "Nothing" or "No problem", teachers often looked, waiting my wordsfor me to say something. When I replied "Nothing" or "No problem", teachers often looked, waiting for me to say something.

"Nothing" and "No problem" are maybe a bit blunt? You could say "No questions, you have explained it well. Thank you" if you fully understand. This is also formal enough to say to a teacher

When I replied "Nothing" or "No problem", teachers often looked waiting my wordat me as if they were expecting further answers. When I replied "No" or "No problem", teachers often looked at me as if they were expecting further answers.