1. The letter should be sent yesterday. But this was not done.
2. You should mention this in your reply.
3. This document should send for signature today.
4. You need to contact the company immediately.
5. They should not have to send the document to the company manager.
Dmitri Mendeleev is a great Russian scientist of the 19th century.He is recognized as a great chemist who created the periodic classification of the elements.Dmitri Mendeleev was born in Tobolsk in 1834. At school,Dmiti succeed in mathematics,physics,and geography but was not good at languages.In 1855 he graduated from Pedagogical institute in St Peterburg with a gold medal for his achievements .In 1856,he received a degree in chemistry.Dmitri Mendeleev's contribution to the world's science was enormous. He was the first created the dependence of the qualities of the elements on their atomic weight.He forecast that the gaps in the table of elements would be filled in by elements which had not been discovered yet.Dmitri Mendeleev was greatly honoured as a member of academies in many countries.Elements No 101 was named after him.
The letter should have been sent yesterday. But it wasn't.
You should have mentioned about it in your answer.
This document should have been signed yesterday.
You should have contacted the firm immediately.
They shouldn't have sent this document to the managing director.