帮忙讲解一道高一英语时态题

题目

帮忙讲解一道高一英语时态题
---If I _______(see)a tiger walking acrosshyde park,I would climb a tree.
---That _____(not be)any use .The tiger______(climb)after you.
可否帮我讲解下

答案

虚拟语气在if条件状语从句中.如果与现在事实相反,则条件从句谓语用动词的过去式（be的话用were）,主语谓语用 should/ would /could/ might + 动词原形.则答案为
saw
wouldn't be would climb