2.The quality of education have many influences for student's scores .
3.Teachers and parents should try to reduce the time that the children watch tv .
2. (Continued)
If there is one student then use "['s]" to indicate possession by one student. Use: "[s']" to indicate possession by two or more students. "Student" in the singular form can also be used as a plural above because "scores" could tell us that there is more then one student and usually you will not need to add some kind of "s" at the end of these words unless you are preparing a legal document or changing the entire sentence to convey your point.
3. "Teachers and parents should try to reduce the time that the children watch tv."
This is correct. The only thing is that if you are trying to sate a general principal then reduce "the" right before the word "children" because "the" in this case tells the reader that this issue of watching TV only applies to a select group of children (and this statement is part of a paragraph not mentioned) rather than children in general.
V/r, Gunner
1.1 Reverse 1 and 2 like so.
It [2: Somebody's self confidence] [1: can improve] ...
1.2 Drop "it" and change "that" to "who" because we are talking about someones quality (not the actual actions that someone is doing) like so:
"Somebody's self confidence can improve who usually do some exercises."
Drop "it" because it is not necessary since we know it in the sentence which is "doing some exercise."
2.The quality of education has many +"an" influences for student's scores.
2.1: Turn "have" to has because "has" is a bit more active in the English language.
By having "many" + "an" allows you to eliminate the "-s" at the end of "student's" and "influence."
This sentence reads that there is only one influence for student's scores which is "quality of education."
By using plural "influences" that means a "quality of education" is not the reason behind student scores and rather merely a cause of an influence that impacts student scores. This is a little in depth but overall, with a statement/argument like this you want to stress that "quality" is the influence not a cause of influence("s").
2.The quality of education have many influences for student's scores .
3.Teachers and parents should try to reduce the time that the children watch tv .