彼がひとりでその仕事を完成したはずがない。

he; him; his; boyfriend

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

one person; alone; unmarried; solitary

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

that (something or someone distant from the speaker, close to the listener; actions of the listener, or ideas expressed or understood by the listener); the; um...; er...; uh...

work; job; business; occupation; employment; vocation; task; work

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

complete; completion; perfection; accomplishment

expectation that something took place, will take place or was in some state; it should be so; bound to be; expected to be; must be; nock (of a bow); nock (of an arrow); nock-shaped grip (between thumb and forefinger); wooden frame on the tip of the mast of a Japanese ship that prevents the hawser from falling out

nonexistent; not being (there); unpossessed; unowned; not had; unique; indicates negation, inexperience, unnecessariness or impossibility; not ...; to not be...; to have not ...