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（动词三单加字母“s”）（动词三单字母加“es”）（动词三单加“ies”）
（1）I usually_____（go）to school by bike,but he______（come）to school by taxi.
（2）He_________（try）on his best to ______（open）the car,but he can’t open it.
（3）My grand mother_______（carry)）some grapes for me.
（4）Nancy is so busy,she ______（sweep）the floor and _____（clean）the table.
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
