Simple past 'checked' belongs to the second conditional (present unreal). The result clause uses 'would not have been' (past unreal), so the if-clause must be past perfect.
PRIMARY 6 · ENGLISH
Synthesis
Top 5 mistakes
Ranked by how often they appear across 109 MOE-aligned practice questions in our archive.
'Would check' is a result-clause form, not an if-clause form. The if-clause of a third conditional uses past perfect, never 'would'.
'Would have checked' belongs in the result clause of a third conditional, not in the if-clause. Putting 'would' in the if-clause is a structural error.
'Exhausting' is the present participle (active) — it would mean the students were tiring others. Here, the students received the action, so a past participle (passive) is needed.
'Exhaust' is the bare form (or a noun meaning fumes). The correct participle form is 'exhausted'; 'being exhaust' is ungrammatical.
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