Follow the footprints of truthful persons.---?

Truthfulness is a great virtue, isn't it?

Tag questions are short questions added to the end of a statement. The general rule is that if the main statement is positive, the tag is negative, and if the main statement is negative, the tag is positive. In the given sentence, "Nothing is better than this quality," the word "nothing" makes the statement negative. Therefore, the tag question must be positive. When the subject of the main statement is an indefinite pronoun like "nothing," "everything," "something," it is replaced by "it" in the tag question. The auxiliary verb "is" from the statement is used in the tag.

Everybody loves a truthful man, don't they? 

The rule for forming tag questions for sentences beginning with 'Let us' or 'Let's' is specific in English grammar. These types of sentences express a suggestion or a proposal that involves both the speaker and the listener(s).

In such instances, the appropriate tag question to use is always 'shall we?'. This is because 'shall' is used to express suggestions or offers, and 'we' refers to 'us' (the speaker and others).

For example:

    
• Let's go to the park, shall we?
    
• Let us start the meeting, shall we?

The main statement is positive, but the tag question is also generally positive in this specific construction, focusing on seeking agreement for the suggestion.