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You should have been looking after the baby．你这段时间是应当照看孩子的。
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时间和体交织在一起，就构成各种时态，与上面三种体相对的是简单体：
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张道真英语用法（大众珍藏版·第二版） [:1704917108]
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106 assist
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assist表示“帮助”：
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John had come home to assist his father．约翰回家来帮助他的父亲。
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We shall assist them in their difficulty．我们将帮助他们克服困难。
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The nurse assisted the doctor in the operating room．护士在手术室帮助医生。
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They assisted in building the house．他们帮助盖这栋房子。
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Can I assist you with those parcels？我可否帮助你拿那些包？
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但这词比较文气，日常用help时更多一些。
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张道真英语用法（大众珍藏版·第二版） [:1704917109]
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107 assure—ensure—insure
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assure表示“向（某人）保证”、“肯定地说”：
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I assure you that this medicine cannot harm you．我向你保证这药对你没有害处。
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They assured the passengers that there was no danger．他们向乘客保证，没有危险。
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I assure you I need you．我向你肯定地说我需要你。
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I assure you that you’re mistaken．我肯定地说你错了。
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也可用于assure of这个短语中：
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I assure you of my full support for your plan．我向你保证全力支持你的计划。
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They assured us of his ability to work．他们向我们保证他有能力工作。
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I assured him of our affection．我向他肯定地说我们是爱他的。
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ensure表示“保证（有）”、“使一定得到”：
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I can’t ensure that he will be there in time．我不能保证他能准时到达。
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