302. Should in the second and third persons may be used in simple declarative sentences and independent clauses to express the will of the speaker ([§ 239]).

II. SHOULD AND WOULD IN SUBORDINATE CLAUSES

303. In some kinds of subordinate clauses, the use of should and would differs considerably from that in simple sentences and principal clauses.

The following classes require attention:—(1) clauses of purpose or expectation ([§ 304]), (2) conditional and concessive clauses ([§ 305]), (3) clauses expressing volition not that of the subject ([§ 306]), (4) clauses stating something as an idea ([§ 307]), (5) indirect discourse ([§ 308]).

304. In subordinate clauses expressing the purpose or expectation with which anything is done, shall and should are used in all three persons.

305. In conditional or concessive clauses expressing a future supposed case doubtfully, shall and should are used in all three persons; but will and would are proper when the subject is thought of as wishing or consenting.

When a future supposed case is admitted or conceded as certain, will may be used in the second and third persons to denote mere futurity.