Question

The essay (P) like that of the human face (Q) because its variety is infinite (R) is a literary form (S) which is not easy to define
The proper sequence should be
A. P Q R S
B. P Q SR
C. R S Q P
D. R S P Q

Answer 1

Hint: Sequence of tenses may be a set of grammatical rules of a specific language, governing the agreement between the tenses of verbs in related clauses or sentences.

Complete answer:
R follows the topic "the essay” because it gives introductory information "is a literary form" about an essay.
S follows R because the R pronoun "which is ..." adds extra information about the literary form.
Q follows S because the words are linked. P follows Q because the words "like that of the human face" are linked with "its variety is infinite". The person forms a comparison of the latter with a person’s face.
Hence the right sequence is RSQP and option C is correct.
Options A, B, and D are incorrect as they do not form a logical sequence.

Note:
To maintain the sequence of tense, we should always maintain the subsequent rules. Rule: If the principal clause is in present then the dependent clause is often in present continuous, present perfect tense, future or past.