1). Past Perfect Tense will be used. The structure is : Subject + had + past participle

We Recommend
RBI, SEBI & NABARD Free Courses Free Combo Course Click Here
RBI, SEBI & NABARD Free Mocks Attempt Free Mock Test
RBI, SEBI & NABARD Complete Courses Get 100% Selection Course 
RBI, SEBI & NABARD Current Affairs Download Free Current Affairs Capsule

2). ‘That boy possesses’ is the correct usage, as the verb must agree with its subject in number and person.

3). No Error

4). Replace ‘have’ with ‘has’.

5). ‘Because of’ is the correct idiomatic form.

6). Replace ‘comes’ with ‘come’.

7). Replace ‘has’ by ‘was’.

8). Replace ‘would’ with ‘did’.

9). Replace ‘at’ with ‘from’.

10). Replace ‘was’ with ‘were’.

Governmentadda Suggests ixambee Courses 
RBI Grade B + NABARD Grade A Course Click Here
FCI AGM Technical Course Click Here
FCI AGM GA Course Click Here