1.  First, passive learning may let us get the knowledge negatively.

2.  Firstly, passive learning can let us get the knowledge negatively, so we can't know and learn better.

3.  Passive learning will let us get the knowledge negatively.

4.  Passive learning may let us get the knowledge negatively, so we can't know and learn deeper and better.

5.  Firstly, passive learning will let us get the knowledge negatively, so we couldn't learn deeper and better.

6.  Firstly, passive learning will let us get the knowledge negatively, so we can't know and learn knowledge more and better.

7.  In my opinion, firstly, passive learning will let us get the knowledge negatively so that we can't gain knowledge better.

8.  Firstly, passive learning will let us get the knowledge negatively.

9.  Passive learning will let us get the knowledge negatively, so we can't know and get knowledge deeper and better, just like these students.

10.  What's more passive learning will let us get the knowledge negatively, and have no power to research new knowledge.