Do's and Don'ts - Modals Usage
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1. Core modal verbs have only one form. They have no to-infinitive form, -ingform, past form or -   d form. We have to reword what we want to say by using other expressions:    i  We'd love to be able to see the The Red Fort one day.    Not: We'd love to can be able to see the The Red Fort one day.    ii She had to sell her farmhouse.    Not: She musted sell her farmhouse 2. Modal verbs are placed first in the verb phrase (after the subject) and are followed by a verb in the base form. The next verb may be a main verb or an auxiliary verb (be, have): 3. Modal verbs do not change form for tense or person. Modal verbs can be followed by the substitute verb do: A: They  thought he might sell  his car. B: Yes, he could do. 4. Modal verbs cannot be used with another modal verb:     Mountaineering  can be difficult.    Not; Mountaineering  can might be difficult.OR Mountaineering might can be difficult. 5. Modal verbs always go before other verbs in a verb phrase:      [in a restaurant after a meal]      I think the bill could be expensive.      Not: I think the bill could expensive. 6. Modal verbs do not need an additional auxiliary in negatives or questions.     For example: Must I come? (Do I must come? Is wrong)

#### Summary

1. Core modal verbs have only one form. They have no to-infinitive form, -ingform, past form or -   d form. We have to reword what we want to say by using other expressions:    i  We'd love to be able to see the The Red Fort one day.    Not: We'd love to can be able to see the The Red Fort one day.    ii She had to sell her farmhouse.    Not: She musted sell her farmhouse 2. Modal verbs are placed first in the verb phrase (after the subject) and are followed by a verb in the base form. The next verb may be a main verb or an auxiliary verb (be, have): 3. Modal verbs do not change form for tense or person. Modal verbs can be followed by the substitute verb do: A: They  thought he might sell  his car. B: Yes, he could do. 4. Modal verbs cannot be used with another modal verb:     Mountaineering  can be difficult.    Not; Mountaineering  can might be difficult.OR Mountaineering might can be difficult. 5. Modal verbs always go before other verbs in a verb phrase:      [in a restaurant after a meal]      I think the bill could be expensive.      Not: I think the bill could expensive. 6. Modal verbs do not need an additional auxiliary in negatives or questions.     For example: Must I come? (Do I must come? Is wrong)
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