高兴

高兴 as Stative verb, means [glad, happy, cheerful; be will to; be happy to]

1, Grammatical features:

1). 高兴 can be modified by adverbs of degree. For example：
 

很高兴 / 真高兴 / 非常高兴 / 特别高兴 / 太高兴了

2). The negative adverb 不 is placed before 高兴 for the negative form.

不高兴

3). The affirmative-negative question can be formed by putting together the affirmative and negative forms of 高兴.

【Structure】AB 不 AB？（= A 不 AB ?）——   高兴不高兴？（= 高不高兴？）

4). 高兴 do not take objects

5). 高兴 can be followed by complements. For example:

高兴极了 / 高兴得很 / 高兴起来

6). 高兴 is a dissyllabic adjective that has two overlapping forms

(1), Used as an adjective: AABB —— 高高兴兴

(2), Used as a verb: ABAB —— 高兴高兴

8. 高兴 also means "like to do"For example:

你高兴去就去，不高兴去就不要去。

2, Function:

1). As an attributive. 

eg): 高兴的人 / 高兴的事 /  高兴的样子

2). As a predicate,是 is not used before 高兴 which functions as the predicate.
 

eg): 他很高兴。(OK)    他是高兴。(X)

3). As an adverbial adjunct. 地 must be used after the adverbial modifier composed of an adjective that is converted from a verb.

(1), 大卫高兴地说：“我考上了北京大学。”

(2), 大家高兴地唱起歌来。

4). As a compliment.

今天我玩得很高兴！

3, Formulas of reduplication

1). Used as adjective：AABB —— 高高兴兴

Adjective Reduplication, to express a deeper degree, to express the speaker's feelings of love and kindness.

Overlapping forms can be used as attributes, adverbials, or complements.

(1), 我喜欢看他高高兴兴的样子。（as attributive）
 

(2), 妹妹背着书包高高兴兴地上学去了。（as adverbial）

(3), 孩子们玩得高高兴兴的。（as complement）

Note:
 

(1), After the Adjective Reduplication, the adjective cannot be modified with degree adverbs such as "很" and "太".

很高高兴兴 (X)

太高高兴兴了 (X)

今天玩得真高高兴兴。(X)

(2), 高高兴兴 can be used as adverbial in the sentence. 地 must be used after adverbial modifier which is the reduplication of 高高兴兴.

她高高兴兴地回家了。

(3), 高高兴兴 can act as the predicate and the particle 的 must be used after them. For example:

妹妹每天都高高兴兴的。

(4), The overlapping form cannot be used in comparative sentences. For example 

他今天比昨天高高兴兴的。(X)

2). Used as a verb: ABAB —— 高兴高兴 （meangs “做某事，使……怎么样”, Adjective Reduplication, make the adjective has the properties of the verb.）

高兴 can be converted into a verb, in which case it can be reduplicated in the formula for reduplicating verbs. For example:

快把这个好消息告诉他，让他高兴高兴。