Перепишите следующие предложения и переведите их на русский язык, обращая внимание на бессоюзное подчинение.

1. It is difficult for us to do this work in such a short time.
2. To go on with this discussion is to waste time.
3. To extend the main street they had to destroy some old buildings.
4. Another reason to consider is the absence of necessary facilities for the experiment.