Is it OK not to use a verb after "no matter" like in sentences 2 and 3?
1) No matter how hard your life is you need to go on.
2) No matter how hard your life you need to go on.
3) You need to go on no matter how hard your life
4) You need to go on no matter how hard your life is.
I know that using "no matter" without a verb is possible, for example,
No matter the outcome I will do it.
No matter the weather we will go there.
But it's not clear for me whether it's possible only in some set-phrases like "no matter weather" or it is possible also in sentences like sentences 2 and 3.