Amud 49b

תוס' ד"ה לבנות

To build a house for her - לבנות לה בית

Summary:
The inference is from; either a. לבנות ולא בנה, b. לה and not להן, c. no מפיק ה"א meaning לא. However תוספות disagrees with ‘b’.

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תוס' ד"ה דברים

Words in the heart, are not words - דברים שבלב אינם דברים

Summary:
A תנאי כפול is required when we are not certain what is the intention of the one making the תנאי, if however he makes it clear what his intention is, we do not need a תנאי כפול; in fact sometimes we do not even need a גילוי מילתא if we are certain of his intentions.

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