[ Past Tenses ]
We use the past perfect tense to show that:
A. One past action happened before another.
B. An action is happening now.
C. An action happened regularly in the past.
D. Something started in the past and continues to now.

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Would rather/ would prefer/ would likeGrammar and VocabularyGrammar - Present PerfectVerbs - third personConditionals III - Mixed 1st, 2nd & 3rd ConditionalsGrammar / PronounsPerfect and Past TenseNoun, Quantifiers and SuffixesAdverbial Concession ClausesPast Simple and Past ProgressiveOther quiz:
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There’s ….. plastic trash in sea nowadays.
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Grammar › View
A catalytic agent such platinum may be used so that the chemical reaction advances more rapidly.
A. such
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