英语 's 读音She's pretty.He‘s been there.How’s it going?中's读\s\还是\z\?原音结尾的动词变单三

英语 's 读音She's pretty.He‘s been there.How’s it going?中's读\s\还是\z\?原音结尾的动词变单三
1 She's pretty.He‘s been there.How’s it going?中's读\s\还是\z\?最好有出处
2以元音结尾的名词变复数+s 、es 读\s\ 还是\z\还是不一定?
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3以原音结尾的动词变单三读s or z还是不一定?
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