It's important to try [and] learn from experience.
动词 go,come,try,write,see 等少数几个动词与其他表示目的动词连用时,可以有以下三种方式：
后面跟不定式动词（正式说法）,如：
He often went to visit the elderly persons of no family in the geracomium.他经常去探望敬老院的孤寡老人.
A lot of our friends came to see me. 我们的很多朋友来看过我.
Please writeto tell me what happened.请写信告诉我发生了什么.
用 and 并列两个动词（口语形式）
He often went and visited the elderly persons of no family in the geracomium.
A lot of our friends came and saw me.
Please write and tell me what happened.
两个动词连用（非正式说法,等于第一种省略 to）
He often went visit the elderly persons of no family in the geracomium.
A lot of our friends came see me.
Pleasewrite tell me what happened.
2、感觉下面的some time是某个时间段的意思,为什么不用in?
除了 in time（及时）和 on time（按时）外,time 前要求用介词at 表示某个时间点,如：
at a time (一次,同时,一下子,每次)
at all times （不论什么时候,老是）
at any time （随时; 无论何时）
at no time （永不...,在任何时候都不）
at odd times （在闲暇的时候,利用零碎的时间; 偶尔）
at one time （过去某个时期,曾经,一度）
at the same time （与此同时,但是）
