216510用英文表达

twenty-one point(小数点就是这个词儿) five

13：45 a quarter to fourteen16：40 twenty to seventeen21：50 ten to twenty-two

twenty one point five

英语中有16种时态 1.一般现在时 the present tense 2.一般过去时 the past tense 3.一般将来时 the future tense 4.一般过去将来时 the past future tense 5.现在进行时 the present continuous tense 6.过去进行时 the past Continuous Tense 7.将来进行时 the future continuous tense 8.过去将来进行时 the past future continuous tense 9.现在完成时 the Present Perfect Tense 10.过去完成时 the Past Perfect Tense 11.将来完成时 the future perfect tense 12.过去将来完成时 the past future perfect tense 13.现在完成进行时 the present perfect continuous tense 14.过去完成进行时 the past perfect continuous tense 15.将来完成进行时 the future perfect continuous tense 16.过去将来完成进行时 the past future perfect continuous tense

twenty one point five

1到13要背，14到19是相应地加后缀teen(注意有些是不规则变化的）20到90多直接在整十后面加几，如85 eighty-five 54fifty-four具体看下面，很简单的。希望对你有用。1 one2 two3 three4 four5 five6 six7 seven8 eight9 nine10 ten11 eleven12 twelve13 thirteen14 fourteen15 fifteen16 sixteen17 seventeen18 eighteen19 nineteen20 twenty21 twenty-one22 twenty-two23 twenty-three24 twenty-four25 twenty-five26 twenty-six27 twenty-seven28 twenty-eight29 twenty-nine30 thirty