doznać in English:

She found it difficult to sustain the children's interest.

This means that we have to be able to sustain our current efforts and

He was desperately trying to sustain the conversation.

The team may not be able to sustain this level of performance. / Our small family bussiness turned into a big company which sustains our whole family now. / He sustained minor injuries in the car accident.

I tried to sustain the conversation but he was just too boring.

1. I tried to sustain the conversation but he was just too boring. 2. She sustaineda sever head injury during the car crash

to sustain coherent conversation