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Not all compound nouns follow the same pattern for plurals.
并非所有复合名词的复数形式都遵循相同的模式。
The plural forms of check-in, passerby, and spoonful are check-ins, passersby, and spoonfuls.
“check-in”、“passerby”和“spoonful”的复数形式是“check-ins”、“passersbr”和“spoonfuls”。
Generally, the plural -s will go on the main or most important part of the noun, and this is usually also the last part of the compound.
一般来说，复数-s会出现在名词的主要部分或最重要的部分，这通常也是复合词的最后一部分。
This is true for cab drivers and chalkboards. Driver, and board are the main parts of the nouns.
对于出租车司机和黑板来说都是如此。Driver和board是名词的主要组成部分。
But in some cases the most important part of the word is not at the end. This is true for mother-in-law where the plural is mothers-in-law.
但在某些情况下，这个词最重要的部分并不是在结尾。对于“mother-in-law”的复数形式是mothers-in-law的情况就是如此。
When no part of a compound noun is a noun, the -s goes on the end.
当一个复合名词的所有部分都不是名词时，-s放在最后。
This is the case for check-ins, grown-ups, higher-ups, go-betweens, sit-ins, walk-outs, and has-beens.
这种情况适用于check-ins签到者、grown-ups成年人、高层higher-ups、go-betweens中间人、sit-ins静坐者、walk-outs罢工者和has-beens过时的人。
All parts of those Compounds are verbs, prepositions, adjectives, or participles.
这些复合词的所有部分都是动词、介词、形容词或分词。
When a compound noun is formed with a noun and a preposition, the -s goes on the noun. This is the case for passersby and hangers-on.
当一个复合名词由一个名词和一个介词组成时，-s在名词上。对于passersby路人和hangers-on食客来说就是这样。
Compounds with -ful can either have the -s on the first part or on the end.
带有-ful的复合词既可以在第一部分，也可以在末尾。
Putting the -s on the first part can sound more formal but putting it on the end is perfectly fine even in formal writing.
把-s放在第一部分听起来更正式，但把它放在结尾是完全可以的，即使在正式的写作中。
So spoonful can be spoonsful (slightly more formal sounding) or spoonfuls (more common).
所以spoonful可以是spoonsful(听起来更正式)，也可以是spoonful(更常见)。
The same is true for bucketful, carful, truckful, mouthful, and handful.
同样的情况也适用于bucketful一桶之量的, carful一车之量的, truckful一卡车之量的，mouthful一口的的，和handful一把的。
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