No comment or no comments? Which is more common? I use no comments more.But I think no comment is more correct.

1)If you are going to the library could you take back some books that I have finished reading? I gather that using some(before books) is necessary here 2)I was visiting (some)friends. But some here is optional. I don't get it why some in 1 is a must.(As per cambridge Advance grammar's book) And in 2 is an option.

Чем отличается? Юрист и адвокат?

Is there a difference between 'besichtigen' and 'besuchen' ?

Die Speise? What does it mean? Food or course? For example first course (salad),second course.... In Russian: Food еда Course блюда

What's the difference ? Make a list of useful phrases connected (with)your activity Make a list of useful phrases connected (to )your activity

As per grammar books "adverbs of frequency" come before the main verb. I was reading a book and noticed: We don't play very often. Is it wrong? Shouldn't it be : we don't very often play. ?

Do you work Monday to Friday? Or Do you work on Monday to Friday? Which one is correct?

It is not grammatically wrong to say "I went nowhere" As an answer to "where did you go?" But is it natural to say so in spoken English?