Usages of kāi
你 可以 开 门 吗？nǐ kěyǐ kāi mén ma?
Can you open the door?
他 正在 开 门。tā zhèngzài kāi mén.
He is opening the door.
门 开 着， 护士 站 在 外面 等 我。mén kāi zhe, hùshi zhàn zài wàimiàn děng wǒ.
The door is open; the nurse is standing outside waiting for me.
我 刚才 忘记 带 书 了， 他 帮 我 开 门。Wǒ gāngcái wàngjì dài shū le, tā bāng wǒ kāi mén.
I just forgot to bring the book; he helped me open the door.
她 忘了 带 钥匙， 只好 在 门口 等 室友 来 开门。tā wàngle dài yàoshi, zhǐhǎo zài ménkǒu děng shìyǒu lái kāimén.
She forgot to bring her keys, so she had no choice but to wait at the door for her roommate to open it.
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Mandarin Chinese has four main tones plus a neutral tone. The same syllable can mean completely different things depending on the tone — for example, "mā" (mother), "má" (hemp), "mǎ" (horse), and "mà" (scold). Mastering tones is essential for being understood.
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