Discussion
Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select 'No substitution required'.
When plastic waste was burnt, a complex weave of toxic chemicals is released.
Answer: B
The correct form is 'is burnt'. The sentence states a general truth in the present: toxic chemicals 'is released' (with 'a complex weave' as subject), so the clause with 'When' needs the present form, 'When plastic waste is burnt'. 'Was burnt' is a past tense that clashes with the present. 'Were burnt' and 'are burnt' use plural verbs, but 'plastic waste' is treated as singular here. The same sentence with the corrected clause reads 'When plastic waste is burnt, a complex weave of toxic chemicals is released', in which both verbs are in the present tense.
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