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past simple present perfect modals modal verbs modal perfects the causative causative formation uses agent passive voice active voice victorian period victorian era victorian age enlightenment poetry romantic reason romanticism recycle containers rubbish bins reduce environmental problems reuse trash cans robert louis stevenson poem verb tenses presentation past tenses type 3 type 2 type 1 type 0 conditional sentences conditionals how many how much little a little few a few lots of a lot of many much any some a/an uncountable nouns countable nouns uncountable countable unless present perfect simple grammar have something done