Google 登录怎么用？和已有密码账号冲突怎么办？

同一个邮箱如果已经用密码注册过，就不能再用 Google 登录；登录后可在账号设置里绑定 Google。Google 登录建出来的账号不走我们的邮箱验证流程。

Questions answered on this page

Google 登录怎么用？
同一个邮箱已经用密码注册过，还能用 Google 登录吗？
用 Google 登录建号，邮箱验证是怎么做的？

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怎么用 Google 登录
邮箱已经被密码账号占用
Google 登录的账号，邮箱算验证过吗
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If this address already has a password account, sign in with that password instead: an address cannot be used for Google sign-in as well, and you can bind Google from account settings after signing in.