|Modal Use |Positive Forms |Negative Forms |You can |
||1-Present 2.- Past 3.- Future | |also use: |
|should |1. People with high cholesterol shouldeat low-fat |1. Sarah shouldn't smoke so much. It's not |ought to |
|recommendation, advisability, |foods. |good for her health.| |
|suggestion |2. Frank should have eaten low-fat foods. That might |2. Sarah shouldn't have smoked so much. |Semi - Modal|
| |have prevented his heart attack. |That's what caused her health problems. | |
||3. You really should start eating better. |3. Sarah shouldn't smoke when she visits | |
| ||Martha next week. Martha hates when people | |
| | |smoke in herhouse. | |
|should |1. Susan should be in New York by now. |1. Susan shouldn't be in New York yet. ||
|expectation |2. Susan should have arrived in New York last week. |2. Susan shouldn't have arrived in New York| |
||Let's call her and see what she is up to. |until yesterday. |be supposed to |
| |3. Susan should be...
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