modal verbs与fronting1)用modal verbs 填空.we be required to ditch the aircraft,there are flotation devices under your seats(There are live-saving devices under your seats for use if we ditch in water.)2)在陈述句中不是都应该用名词

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modal verbs与fronting
1)用modal verbs 填空
.we be required to ditch the aircraft,there are flotation devices under your seats(There are live-saving devices under your seats for use if we ditch in water.)
2)在陈述句中不是都应该用名词开头吗,难道用了fronting?
3)解释fronting

动作或事件不规则前移在语法中本该的有位置.有强调的作用