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\n<\/span><\/span><\/span> There are<\/span> two<\/span><\/b> types of past: <\/span><\/span>past<\/span> that is <\/span>clear<\/span><\/span> <\/span>and<\/span> <\/span>past <\/span>that is <\/span>unclear<\/span>. <\/span><\/span><\/span><\/span>
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\n<\/span><\/span>An Unclear <\/span>Past: How unclear <\/span>is it?<\/b><\/i><\/span><\/span><\/span>
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\n<\/b><\/span><\/span><\/span><\/span><\/p>\nSorry<\/span> that you have to meet your boss again. At a <\/span>meeting<\/span>, your boss may say something like this: \u2018JM<\/span><\/span>B, <\/span>our main competitor<\/span>,<\/span> has changed<\/span> its selling strategy<\/span><\/span>.\u2019 <\/span>(<\/span>The short form of <\/span>\u2018has changed\u2019 <\/span>is<\/span> \u2018<\/span>The company<\/span>\u2019s changed<\/span> <\/span>it selling strategy<\/span>.<\/span>) <\/span><\/div>\n
\n<\/span><\/div>\n <\/span><\/div>\n <\/o:p><\/span><\/div>\nBased on your boss\u2019s words, do you know when<\/span> ABC changed its strategy? Or in which year<\/span>? Which month<\/span>? Which date<\/span>? <\/span>Not<\/span> sure, right? But <\/span>one thing<\/span> you are pretty sure of is that: <\/span>It is<\/span> in the past<\/span><\/span>. <\/span> <\/o:p><\/span><\/div>\n
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This is what an<\/span> unclear<\/span> <\/span>past is about. That is, somehow you know something has happened but you know nothing about the <\/span>exact<\/span> <\/span><\/span>year<\/span>, <\/span>month<\/span>, <\/span>week<\/span><\/span>,<\/span> or<\/span> date<\/span><\/span>. <\/span>Other <\/span>examples<\/span><\/span> from your boss may include:<\/span><\/div>\n
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<\/span><\/span>Our profits <\/span>have dropped<\/span><\/span> (<\/span>by 20%<\/span>). <\/span>(short form: <\/span>\u2019ve dropped<\/span>)<\/o:p><\/span><\/div>\n
\n<\/span><\/div>\n The government<\/span><\/span> has raised<\/span><\/span> <\/span>the rates of business tax<\/span>. <\/span> <\/span>(short form: <\/span>\u2019s raised<\/span>)<\/span><\/o:p><\/span><\/div>\n <\/o:p><\/span><\/div>\n<\/div>\n
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\n<\/span><\/div>\nThe tense used (<\/span>have dropped<\/span><\/span>, <\/span>has raised<\/span><\/span>) has a long name, the <\/span>present perfect simple <\/span>(PPS)<\/span>. The tense is made up of by<\/span> two<\/span><\/span> elements:<\/o:p><\/span><\/div>\n<\/div>\n
\n<\/span><\/div>\n<\/div>\n
1. <\/b><\/span>has \/ have<\/span><\/b> <\/span>( <\/span>\u2019s \/ \u2018ve<\/span>) +<\/span><\/o:p><\/span><\/div>\n
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