Fill in the Blanks Past Modals.Online version Modal verbs in the past, also known as modal preterite or modal past, are used to express modalities like possibility, necessity, obligation, or permission in the past. In English, the modal verbs "could," "might," "should," and "would" are typically used to convey these modal meanings in the past tense. *Complete the following sentences by selecting the right choices. by Leticia Moreno 1 should has have might would could She studied harder for the exam . 2 have has might would could should We left earlier to avoid the traffic . 3 have would might has could should He forgotten to lock the door before leaving . 4 have could has might would should They finished the project on time if they had worked together . 5 could might have has should would I helped you with your homework if you had asked . 6 have might could would has should She listened to her parents' advice before making that decision .