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St modals + have + v3+ ow, A.V, Ihast qeuçe, St modalş + have +teeu + v3+ by to – P:V, En : o she should write a letter, > A lettu should be written by her, o She should have urittuu a lettu, by, A letter shoutd have been written, her, Modals_are ufed with couditioual funteuces.__, Rule1:, (1) S+ will, shall, Cong, + v'+ Ow a, cau, Must, cony, + s+v°+ow, (2) S+ uould + v + Ow 1, could, migut, couj, (3) S+ would, could, + have +u34 Ow, r º+ s+ had +v³+ow, might, Ex: ůj If you Come to me I will help you, (i) f you, came to me I would help you, üy f you, you, had come to me I would have helped