The simple past just tells what happened. Past modals tell what could have, would have, and should have happened. To form these past modals, use could, would, or should followed by have, followed Should have. Usiamo "should have" per dare, o chiedere, un'opinione al presente su qualcosa che è successo nel passato: "I had a terrible stomachache." "You should have gone to the doctor’s." "I didn’t hear from my father last week." "You should have called him." "She isn't happy with the salary she’s getting." How to Remember the Difference. Use "should" to say that something is the right thing to do; use "would" to talk about a situation that is possible or imagined. So, add another modal, such as "could," to the sentence to see if it still makes sense. For example, you could say: Fold at your hips with your arms crossed at your chest or behind your head. Lift your shoulders to elevate your torso. At the top of the repetition, your body should be in a straight line. For Tighten your thigh muscle with your knee fully straightened on the bed, as with the quadriceps set above. Lift your leg several inches. Hold for 5 to 10 seconds. Slowly lower. Repeat until your thigh feels fatigued. This exercise should take 3 minutes. You also can do leg raises while sitting. This exercise strengthens the muscles of the hips, abdominals, and thighs. Lie on your back with your knees bent and your heels close to your buttocks. Your feet should be shoulder-width apart. It .

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