For the following questions answer them individually
Identify the segment that contains a grammatical error. If there is no error, select 'No error
The day before yesterday he left for Europe by the air.
Identify the segment that contains a grammatical error. If there is no error, select 'No error'
I wish I have worked harder than I did.
Identify the segment that contains a grammatical error. If there is no error, select 'No error'
This document has signed by two persons.
Select the option which is the most appropriate one word substitution for the given group of words.
That which cannot be seen through