假如他来了, 我们对他说什么呢? If he were to come, what should we say to him. 假如他看见我, 就会认识我。 If he should see me, he would know me.
together.
3. 与将来事实相反
从句的谓语用If I (we, you, he, they) + 动词过去式或 were to do 或should do 形式, 主句谓语用should(第一人称) /would (第二、三人称) /could/ might + 动词原形。
If he got up early, he would be on time.
b. If you _h_a_d__g_o_t (get) up earlier, you w__o_u_ld__h_a_v_e__ca_u__g_h_t (catch) the first train.
c. If I _h_a_d__m__et(meet) you yesterday, we ____w_o_u_l_d__h_a_v_e_g(ognoe) to the concert
2. 与过去的事实相反
从句的谓语用had+过去分词, 构成If I (we, you, he, they)+had+过去分词的 形式; 主句的谓语用should(第一人称)/would (第二、三人称) /could/might have +动 词过去分词。
If he _h_a_d_d_r_i_v_e_n_ more carefully, he w__o_u_ld__n_o_t_h_a_v_e__h_a_d_ the car accident yesterday.
b. 虚拟条件句 表示条件是无法实现或几 乎无法实现的, 采用虚拟语气。