1, "Have" is the auxiliary verb used to form perfect tenses.

2, Therefore, what are accessory word and auxiliary verb?

3, How to use auxiliary verb better?

4, It is an auxiliary verb.

5, It'serves here as an auxiliary verb,(http://sentencedict.com/auxiliary verb.html) as in sentence 4.2 a.

6, In practical language activities, Japanese accessory word and auxiliary verb can't be applied independently to form a sentence, they can only append to a word.

7, Take an auxiliary verb, an article and a drink and spell an animal.

8, Japanese accessory word and auxiliary verb have obvious differences either in expressing meanings or practical language applications compared with nouns, verbs or, other words.

9, In Chinese, the classification of the auxiliary verb and the adverb always have dispute.

10, In sum, what mentioned above all belongs to the features of Japanese accessory word and auxiliary verb.

11, As a result, we can supplement a words grammatical meaning if it is followed by accessory word and auxiliary verb.

12, It often occurs in an interrogative sentence or a sentence with an auxiliary verb.

13, Comparing "word", we can find out this special feature of accessory word and auxiliary verb.

14, The Past Perfect Tense is formed by combining the auxiliary verb 'had' with a past participle.