#Grammar_Note

📔 Auxiliary Verbs

🔺 Auxiliary Verbs are the verbs be, do, have, will when they are followed by another verb (the full verb) in order to form a question, a negative sentence, a compound tense or the passive.

▪️ I am a doctor.
▪️ I have opened the door
▪️ Do you work or are you a student?

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#Grammar_Note

COMPOUND NOUNS

You have noticed that the compound noun can be written either as a single word, as a word with a hyphen, or as two words. There are no clear rules about this. A good rule of thumb is to write the most common compound nouns as one word, and the others as two words.

The elements in a compound noun are very diverse parts of speech.

🔺 noun + noun
▪️bedroom
▪️water tank
▪️motorcycle
▪️printer cartridge
🔺 noun + verb
▪️rainfall
▪️haircut
▪️train-sporting
🔺 noun + adverb
▪️hanger-on
▪️passer-by
🔺 verb + noun
▪️washing machine
▪️driving licence
▪️swimming pool
🔺 verb + adverb
▪️lookout
▪️take-off
drawback
🔺 adverb + noun
▪️onlooker
bystander
🔺 adjective + verb
▪️dry-cleaning
▪️public speaking
🔺 adjective + noun
▪️greenhouse
▪️software
▪️redhead
🔺 adverb + verb
▪️output
▪️overthrow
▪️upturn
▪️input