Answer:
Amazon sells a lot of products not only books ( sell )
Tenses Rules :
Simple Present,
S + 1st form of verb + O
Simple past,
Subject + 2nd form of verb + O
Simple future,
S + will or shall + 1st form of verb + O
Present continuous,
S + is/am/are + 1st form of verb (ing) + O
Past continuous,
S + was or were + 1st form of verb (ing) + O
Future continuous,
S + will or shall + be+ 1st form of verb (ing) + O
Present perfect,
S + has/have + 3rd form of verb + O
Past perfect,
S + has + 3rd form of verb + O
Future perfect,
S + will /shall + have + 3rd form of verb
Present perfect continuous,
S + has/have + been + 1st form of verb (ing)
Past perfect continuous,
S + had been + 1st form of verb (ing)
Future perfect continuous,
S + will or shall + have been + 1st form of ver b (ing) + O