xcode c语言教程:几道英语填空题

1. that...travels My teacher told me后接that引导的宾语从句,在表示真理时时态始终用一般现在时所以用travels
2.if/whether 表示是否
在以下情况下只能用whether
接不定式 如:I'm not sure whether to go.
介词之后 如:It depends on whether the letter arrives in time.
句型whether or not
引导主语从句 如:Whether they win or lose is all the same to me.

1.that travels
2.if

答whether的全部错

whether只用于否定形式

if用于肯定形式

第2题从句中明显是肯定形式

1.that travels 陈述客观事实,真理,用一般现在时
2.whether条件从句.

1.Light travels faster than sound.My teacher has told me.
My teacher has told me (that )light (travels )faster than sound. (that用以导出从属子句：引导表述结果、愿望、目的、原因或理由的从句, 光传播速度比声音快是永恒的真理，在从句中用一般现在时，不受主句时态影响)
2.Can they speak French.I want to know.
I want to know (whether )they can speak French.(whetherv[接名词从句]是否)

1.that travels
2.if /whether

分析:这两句都是宾语从句.多数的宾语从句都用that.if.whether.who.which.whom...
1.老师说的"..."是一陈述句.所以用that;而光速比声速快是真理.所以动词用一般时态.(这里用第三人称单数)
2.if/whether都是"是否"的意思.就是"我不知道他们是否会说法语.
而if和whether的区别是:句末有or not的话只能用whether.
如:I want to know (if/whether )they can speak French.
I want to know (whether )they can speak French or not.

1.that more 我觉得像是考比较级
2.if /whether