3. Verbs:

3.1 (Monosyllabic) action verbs are linked with all the suffixes zhe, le, guo. By way of example:
看着 kànzhe (reading/looking)
看了 kànle (read [once at a past moment/time])
看过 kànguò (have/had read [at least once])
Le at the end of a sentence is separated from sentence. By way of example:
火车到了 huǒchē dào le (Completed action: The train came/has come.)

3.2 Action Verbs and their Objects are separated. For example:
看信 kàn xìn (read a letter),
吃鱼 chī yú (eat fish)
开玩笑 kāi wánxiào (make a joke)
However, the action verb and object are linked once they together express a single notion. For instance:
吃饭 chīfàn (eat/make a living)
睡觉 shuìjiào (sleep)
看书 kànshū (read)
打球 dǎqiú (play [ball game])
The syllables of Verb+Object type compound phrases are written separately when one more component is inserted between the syllables. For example:
鞠躬 jūgōng (bow)

3.3 An Action Verb and its complement are linked if the two are monosyllabic. Or they can be separated. As an example:
搞坏 gǎohuài (ruin it)
走进来 zǒu jìnlái (walk in)
修理好 xiūlǐ hǎo (fix/repair [and make] it [mended])

4. Adjectives:

4.1 Monosyllabic adjectives link with their reduplicated prefixes or suffixes. For example:
蒙蒙亮 mēngmēngliàng (dimly bright)
亮堂堂 liàngtāngtāng (brightly lit)

4.2 Adjectives are separated from xiē, yīxiē, diǎnr, yīdiǎn that follow them. For example:
快一些 kuài (yī)xiē ([be] faster)
快一点 kuài (yī)diǎn ([be] faster)

5. Pronouns:

5.1 Guys signifies the plural and it is linked with the noun in front of it. For example:
我们 wǒmen (we/us)
他们 tāmen (they/them)

5.2 Demonstrative pronouns zhè, nà and the interrogative demonstrative pronoun nǎ are separated from the nouns that follow them.
这（个）人zhè (ge) rén (this person)
这只船 zhè zhī chuán (this boat)
哪张报纸 nǎ zhāng bàozhǐ (which newspaper?)
zhè, nà, nǎ are linked with xiē, me, yàng, bān, lǐ, biān, huǐr, ge
这些 zhèxiē (these)
这个 zhège (this one)
那样 nàyàng (that way/then)

5.3 Gè, měi, mǒu, běn, gāi, wǒ, nǐ, and so forth are separated from the nouns or measure words that follow them. For example:
各国 gè guó (each country)
各个 gè gè (each, every)
每年 měi nián (every year)
该公司 gāi gōngsī (this/that company)

6. Numerals and measure phrases:

6.1 Total numbers from eleven to ninety-nine are written with each other
十五 shíwǔ (fifteen)
三十三 sānshísān (thirty-three)

6.2 Bǎi (hundred), qiān (thousand), wàn (ten thousand), yì (hundred million) are linked with the integer in front of them, but “ten thousand” and “hundred million” are separated from zeros following them. For example:
九亿零七万二千三百五十六 jiǔyì líng qīwàn èrqiān sānbǎi wǔshíliù (900,072,356)

6.3 Di + Numeral indicates order, and it really is linked by a hyphen with all the amount. For example:
第十三 dì-shísān (thirteenth)
第二十八 dì-èrshíbā (twenty-eighth)

6.4 Numbers and Measure Wordspeople)
一个人 yī ge rén (one people)
两大碗饭 liǎng dà wǎn fàn (two big bowls of cooked rice)
“Duō, lái, jǐ” indicate a rough amount, and they're separated from the numbers and measure words that precede and follow them. For instance:
一百多个 yībǎi duō ge (more than 100)
十来万人 shí lái wàn rén (about 100,000 people)