1. If the quotation forms a sentence independently and the meaning is complete, put the period in quotation marks.
Example: I think of a poem by Jia Dao in the Tang Dynasty: "but toward which corner of the mountain, how can I tell, through all these clouds?."
2. If the quotation is incomplete or used as a part of the text, the period is put outside the quotation marks or not used.
There are two situations:
(1) There is no need to pause before the quotation ends, so there cannot be any punctuation marks afterwards.
For example, Mr. Lu Xun's action portrayal is "looking down on a thousand fingers and bowing down to be a Confucian ox".
(2) The quotation just needs to pause at the end, so the period should follow the quotation marks.
Example: The alley, the spring water, the green grass and the moss have become the shadows that are hard to find-it can really be said that "the dream is deep and deep, and every street and lane is always close to love".
Extended information
About punctuation marks
1. Strictly speaking, punctuation marks must be added to all written works, but there is a tendency to omit punctuation marks in modern poetry. It is an irregular behavior to omit punctuation marks, especially in poems that need to be broken. For example, "injured bird let me touch your wings" should be "injured bird, let me touch your wings." (Red Leaves "Love")
2. Punctuation can not only be omitted, but also can not be used indiscriminately. Take "injured bird, let me touch your wings" as an example: it can not be written intentionally ",injured bird, let me touch your wings"; Or "wounded bird, let me touch your wings and arms". If words with special meanings need to be separated, you can "borrow" dashes.