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1. It's an empty promise. It's called bait and switch.
What is "bait and switch"? Is it like breaking your promise after you get what you want?
2. When you ask a girl for her phone number she is thinking "Do I really want this guy calling my house?" Basically, she decides how much she likes you.
Is it right the underlined part? I think it should be "she decides it according to how much she like you". Am I right?
I didn't know 1), but I guess you're right.
2) looks fine to me. She has to decide how much she likes you before considering giving you her phone #. There are 2 (linked) decisions here: i) how much she likes you and ii) will she give you her phone #.
1. It's an empty promise. It's called bait and switch.
What is "bait and switch"? Is it like breaking your promise after you get what you want?
from M-W online:
Main Entry: bait and switch
Function: noun
: a sales tactic in which a customer is attracted by the advertisement of a low-priced item but is then encouraged to buy a higher-priced one
bait and switch 
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