Auxiliary verbs such as can, could, should, must, may, and might are used to provide additional meaning to the main verb in a sentence. They are placed between the subject and main verb and have specific grammatical features, including not taking third person endings, not using do/does for negatives or interrogatives, and being followed by infinitives without "to." These auxiliary verbs express meanings like permission, ability, obligation, possibility, and advice.
2. THEY ARE AUXILIARY VERBS THAT PROVIDE ADDITIONAL AND SPECIFIC MEANING TO THE MAIN VERB OF THE SENTENCE. THEY ARE: CAN, COULD, SHOULD, MUST, MAY, MIGHT
3. THEY ARE PLACED BETWEEN THE SUBJECT AND THE MAIN VERB EXAMPLE: MARY COULD PLAY THE PIANO S V M
4. FEATURES: 1.NO 3RD PERSON ENDINGS. HE CANS SKI/HE CAN PLAYS 2.NO DO/DOES/DON卒T/DOESN卒T FOR NEGATIVES OR INTERROGATIVES. HE DOESN卒T CAN READ ENGLISH 3.NO INFINITIVES NOR GERUNDS. TO MUST/ MUSTING
5. 4.THEY ARE FOLLOWED BY INFINITIVES WITHOUT TO SHE MUST DO HOMEWORK 5.THEY DON卒T HAVE ALL THE TENSES PRESENT: SHE CAN SPEAK FRENCH FUTURE: SHE WILL BE ABLE TO SPEAK CHINESE
6. PERMISSION Can I go to the toilet, please? LESS FORMAL Could you please tell me the time? May I see your passport, sir? ABILITY She can play the piano ( in the present) She could play the piano (in the past) MORE FORMAL
7. OBLIGATION You must be at home at 12 o卒clock PROHIBITION You mustn卒t smoke here POSSIBILITY The roads can/may/might/could be blocked by the snow
8. IMPOSSIBILITY She can卒t be your mum because she卒s only 22 years old. ADVISE You should stop smoking You shouldn卒t eat so much fat CERTAINTY Look at his poor clothes! He must be a beggar.