So as to, so as not to

 So as to= in order to জন্য, যাতে

So as not to = in order not to যাতে না হয়

* I studied really hard so as to pass the exam. 

*She packed yesterday, so as to be ready early today. 

*He hurried so as to be in time for the train. 

*She worked hard so as to pass the test.

* Uses of so as no to:

1. We have to proceed carefully so as not to ignite the situation.

2. The thief carried the life carefully so as not to hurt himself.