Auxiliary Verb adalah kata kerja yang ditulis sebelum main verb.
Source here
Contoh:
- Do – Do di sini digunakan sebagai penekanan pada kalimat normal.
- They do yoga.
- Do we have time?
- He does not know the truth.
- To be [am, is, here, was, were, be, being, been] – biasanya digunakan untuk membentuk present atau past continous tense
- Present Continous:
- She is washing her clothes.
- Past Continous:
- They were eating burger last night.
- Present Continous:
- Have [have, has, had] – digunakan untuk membentuk Perfect Tense
- Since February 2009, I have studied in United States.
- I have been following your blog since 2 years ago.
- I had too much dream last night.
Blog English Club 
kindly cross check: Since February 2009, I has studied in United States.
first person pronoun ‘I’ bukannya diikuti have ya?
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You are correct. Thank you for the correction. We overlooked this one. Many thanks! 🙂
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More suplement for my practice in writing english. Thanks a lot 🙂
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pak, kalo mau jadi contributor gimana caranyaah? mau dong nulis soal grammar2an. pan sini grammar nazi 😀 . hihihi, ga ding biar ga lupa sama materi kuliah jamaaan duyu 😀 😀
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