correcting these sentences!

1.Most teachers would prefer classes of between 20-30 students since they believe that smaller classes for effective learning than bigger classes.

SUGGESTION
(1. Most teachers would prefer classes of between 20-30 students as they believe that small classes are more effective than bigger ones.)

2.There are advantages of small-classes teaching.

SUGGESTION
(2. There are many advantages for small-classes teaching.)

3.Teacher can concentrate on smaller students to teach them more and more knowledge.

SUGGESTION
(3. Teachers can concentrate on teaching smaller group of students to enrich their knowledge.)

4.Another reason is it can also reduce teacher's workload since the amount of students reduces.

SUGGESTION
(4. Another reason for small-classes is it can also reduce the workload of teachers.)

5.After all, no policy can satisfy everyone, although I like being in a bigger class, I know that small class teaching is better.

SUGGESTION
(5. To summarize, no policy satisfies everyone. Although I like to be in a bigger class, I know smaller one is better.)

6.Because teachers can students effectively, students pay closer attention and have more opportunities to answer question to teacher.

SUGGESTION
(6. As teachers are teaching effectively, students can have more attention from the teachers and more opportunities to ask questions.)

1.Most teachers would prefer a class size of 20 to 30 students since they believe that smaller classes can be more effective learning than bigger classes.

2.There are advantages for small-class teaching.

3.Teachers can focus with a smaller number of students and teach them more knowledge.

4.Another reason is that it can also reduce the workload of teachers as the number of students is lowered.

5.After all, no policy can satisfy everyone. Although I like being in a bigger class, I know that small class teaching is better.

6. Since teachers can educate their students effectively in a small class, students will pay closer attention and have more opportunities to answer teachers' questions.

1.Most teachers would prefer classes of between 20-30 students since they believe smaller classes are more effective for learning.

2.There are advantages to teaching smaller classes.

3.Teacher can concentrate more on the students and teach them to be more knowledgable.

4.Another reason is, since there are less students the workload on the teacher is greatly reduced.

5.After all, no policy can satisfy everyone, although I like being in a bigger class, I know teaching a smaller class can be more effective for learning.

6.Teachers can teach students more effectively, students pay closer attention therefore have better opportunities to answer the teachers' questions.