māma ràng wǒ chūmén de shíhou dài shàng màozi, shuō wàimiàn de tài yáng tài dà.

Mom tells me to put on a hat when going out, saying the sun outside is too strong.

Breakdown of māma ràng wǒ chūmén de shíhou dài shàng màozi, shuō wàimiàn de tài yáng tài dà.

• 我wǒ: I
• 的de: possessive particle
• 太tài: too
• 说shuō: to say

Questions & Answers about māma ràng wǒ chūmén de shíhou dài shàng màozi, shuō wàimiàn de tài yáng tài dà.

What exactly does 让 mean here, and why is it used instead of something like “tell” or “ask”?

In 妈妈让我出门的时候戴上帽子, 让 is a verb that means “to make / to have / to ask someone to do something”.

Structure:

• 让 + person + verb phrase
• → 让 我 戴上帽子 = “have me / tell me to put on a hat”

Nuances:

• 让 is neutral and very common in everyday speech.
  • It can feel like “tell” or “ask” in English, depending on tone:
    
    • 妈妈让我早点回家。= Mom told/asked me to come home early.
• It doesn’t automatically mean “allow/let” (though it can in other contexts):
  • 妈妈让我去旅行。= Mom lets/allows me to travel.

Here it’s “Mom told me / made me / had me put on a hat.”

What is the structure of 妈妈让我出门的时候戴上帽子? Who is doing what, and when?

The underlying structure is:

• 妈妈 在 我 出门 的 时候 让 我 戴上帽子。

The sentence in full is:

• 妈妈 / 让 / 我 / 出门的时候 / 戴上帽子
• Subject: 妈妈 (Mom)
• Main verb: 让 (to have/tell)
• Person being told: 我 (me)
• Time phrase: 出门的时候 (when [I] go out)
• Action: 戴上帽子 (put on a hat)

So the logical meaning is:

• “Mom, at the time when I go out, tells me to put on a hat.”

In Chinese, time phrases like 出门的时候 can be quite flexible in position. A more explicit version:

• 妈妈在我出门的时候让我戴上帽子。
  Literally: “Mom, when I go out, tells me to put on a hat.”

Why do we say and not just ?