15. He ____ (break) his leg while he ____(skateboard).

Question

BlackTom AI · Accepted Answer

Consider the sentence: '15. He ____ (break) his leg while he ____(skateboard).' We are looking for the past simple form for the first verb and the past continuous form for the second verb to show an action that occurred in the past during another past action.
Option 1: 'broke, was skateboarding' uses broke (past simple) for 'break' and was skateboarding (past continuous) for 'skateboard'. This aligns with the standard grammar pattern: He broke his leg while he was skateboarding, indicating two actions in the past with the ongoing one happening when the interruption occurred. This option is correct.
Option 2: 'break, was skateboarding' uses the present tense 'break' instead of past tense, which mismatches the past-time context of the sentence.
Option 3: 'breaked, was skateboarding' uses an incorrect verb form; 'break' does not take the -ed ending in past simple, and 'breaked' is not accepted in standard English.
Option 4: 'broke, skateboard' has 'skateboard' as a noun rather than the required verb form; it would read awkwardly as 'He broke his leg while he skateboard,' which is ungrammatical because the verb form is missing.
Option 5: 'was breaking, was skateboarding' uses two past progressive forms; while 'was breaking' is a valid past continuous, the sentence better expresses a single interrupted action with a simple past verb for the break, not two continuous actions, making this choice awkward and less natural than the standard pairing in Option 1.

15. He (break) his leg while he (skateboard). 单项选择题

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15. He ____ (break) his leg while he ____(skateboard). 单项选择题