I I E2,R2_S2 E2 ,R2 —S2 b. E i ,R i _S i Ei,Ri_Si RTC x > S2 ,R2 ,E2 S2,R2 ,E2 x' In (7a), the RTC can apply to associate the points S 2 and R2 to S i and R 1 without violating the CDTS.
However, as (lc) indicates, restrictions obtain that prevent the arbitrary coupling of matrix and adjunct tenses. Furthermore, the restrictions on tense consortia extend to multitensed sentences in which the tenses fail to receive a temporal interpretation, as, for example, under the counterfactual reading of (1d). (le) indicates that in these tensed but not temporally interpreted constructions, restrictions obtain that prevent certain tenses from occurring with others. What are these restrictions, and how are they to be explained?
Modals conform to these restrictions as well. 5 modals were seen to be tensed. Modals such as might, can, and may have S,R,E form; modals such as might have, could have, and may have have E,R_S form. I argued that these assumptions lead to a smooth account of modal + adverb constructions. The same assumptions carry over to these more complex cases as well. The sentences in (29), all of which conform to the present theory, have the tense structures shown in (30). (29) a. John might leave after Harry comes b.