小学英语中判断时态的方法如下：
一般现在时
标志词：always, usually, often, sometimes, never, every day, every week, every month, every year等。
结构：主语 + 动词原形（第三人称单数时加-s或-es）。
例句：
She often reads books on weekends.
They go to school from Monday to Friday.
一般过去时
标志词：yesterday, ago, before, just now, two hours ago, last week, last month, last year等。
结构：主语 + 动词的过去式。
例句：
They played football in the park yesterday.
I was watching TV when the phone rang.
一般将来时
标志词：tomorrow, next week, next month, in + 时间段（in a month, in two days, in an hour等）。
结构：主语 + will + 动词原形，或主语 + be going to + 动词原形。
例句：
We will go to the beach next weekend.
She is going to travel to France next year.
现在进行时
标志词：now, listen, look, at the moment, at this moment等。
结构：主语 + be动词（am/is/are）+ 动词的-ing形式。
例句：
They are playing basketball now.
I am studying English at the moment.
通过以上步骤和标志词，可以较为准确地判断小学英语中的时态。希望这些信息对你有所帮助。