Starfish, with anywhere from five to eight arms, have a strong regenerative ability, and if one arm is lost it quickly replaces it, sometimes by the animal overcompensating and growing an extra one or two.
语法 Sentence Correction-15406
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正确的用户笔记
小灰灰 2014-03-30 21:55:00
if X,Y的句型，XY要么同时是主动要么同时是被动，不能混着用。这里if主从句语态不一致，错误。if one arm is lost it is quickly replaced或者if they lose one arm they quickly replaces it。it指代Starfish，根据后面的have可以判断应该用复数。
jessicachow 2016-01-19 17:26:49
if… then…结构同主同被，if one arm is lost(被动)it quickly replaces it(主动)，且前一个it指代的是starfish,应该为复数they，因为未划线部分动词为have.
moneysharon 2015-08-11 09:47:06
conditional 从句的两个部分应该同为active 或者同为passive,主语复数 it错误
toujiejie 2016-03-23 16:49:12
if then俩个部分同为主动或同为被动
jessicachow 2016-01-19 17:26:48
if… then…结构同主同被，if one arm is lost(被动)it quickly replaces it(主动)，且前一个it指代的是starfish,应该为复数they，因为未划线部分动词为have.
莹火夏夜 2015-11-18 23:02:02
qqq
loanic 2015-11-06 06:31:33
第一个it指代starfish，由have可知，该starfish为复数形式
viola940515 2015-10-13 15:55:13
第一点，if X,Y的句型，XY要么同时是主动要么同时是被动，不能混着用。这里if主从句语态不一致，错误。if one arm is lost it is quickly replaced或者if they lose one arm they quickly replaces it。 第二点，it指代Starfish，根据后面的have可以判断应该用复数。
lwl626591 2015-08-29 01:27:57
if X,Y的句型，XY要么同时是主动要么同时是被动，不能混着用。这里if主从句语态不一致，错误。if one arm is lost it is quickly replaced或者if they lose one arm they quickly replaces it。it指代Starfish，根据后面的have可以判断应该用复数
kaka0806 2015-08-16 14:42:31
两个it指代不同的内容
miss90 2015-07-25 12:42:21
f X,Y的句型，XY要么同时是主动要么同时是被动，不能混着用。这里if主从句语态不一致，错误。if one arm is lost it is quickly replaced或者if they lose one arm they quickly replaces it。it指代Starfish，根据后面的have可以判断应该用复数。
