unless和if not使用互换辨析？

She wouldn't sing it if she hadn't learnt it.

脱离语境，上句是否有2种理解呢？

真实的或新的吗？

章振邦的新编高级语法书上510页，说

上句可用unless改写=...unless she had learnt it.

我的困惑是：

1）上句如果是虚拟语气，怎么可以用unless改写呢？

2）我认为上句只能是虚拟语气理解，能表示真实的条件句吗？如果可以，怎么理解这种语境呢？

unless 引导的肯定条件状语从句通常可以改为 if 引导的否定条件状语从句。如：

I want you to keep working unless I tell you to stop. (=... if I don't tell you to stop.) 如果我没说让你停，你就得继续工作。（摘自《薄冰英语惯用法词典》p.1245）

She wouldn't sing it if she hadn't learnt it. = She wouldn't sing it unless she had learnt it.

黎反修 - 英语翻译（已退休）

擅长：数词用法,存在句,英语考试 | 采纳率 32% | 回答于 1秒前

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