初中英语问题，大神来回答!

可以说become a big problem，不要加to

vi. 成为；变得；变成  （不及物）

vt. 适合；相称  （及物）

一般做及物动词时，不接to；做不及物动词时，接to

但我们一般用become，都是将它用作连系动词

如The weather became warmer. 天气变暖和了。

Pollution from cars has become a major problem. 汽车污染已成为严重的问题。

下面给两个become to的例句

Movies and television do make people more violent, so the more we see violent acts on movies andtelevision, the less sensitivewe become to them. 

电影与电视的确令人们更具有暴力性，所以，我们从电影或电视中看到的暴力行为越多，我们对它们就会变得越麻木。

The more skills you have and the more job functions you can perform, the more valuable you become to your current employer (and to a future employer). 

你拥有越多的技能，你能履行越多的工作职能，你就变得对现雇主越有价值 （还有未来的雇主）。

become to用的比较少，上面是两个例句

become [bi'kʌm]
vi.
成为，变为，开始变得，变成，转为：
She became ill.
她生病了。
Halen became famous.
海伦成名了。
The weather in spring became warmer.
春天天气变得更暖和了。
She became tired and went to bed.
她疲劳得去睡觉了。
逐渐成为，逐渐变成(或发展成为)：
The tadpole has become a frog.
这个蝌蚪已长成青蛙。
Children become adults.
儿童长大成人。
She became a ballerina.
她成了一名演主角的芭蕾舞女演员。
[古语]发生，产生：
It sometimes becomes that those accounts are mistaken.
有时会发生这样的情况，那些报道是错误的。
vt.
适合，适宜；同…相称：
Modesty becomes him.
他的谦虚很是得体。
It doesn't become you to speak like that.
你不宜像那样说话。
(外观上)合适，使好看，使更美：
That hat becomes you.
那顶帽子你戴合适。
That dress becomes her.
那件连衣裙她穿很合适。
Lavender always becomes you.
你穿淡紫色总是更好看。
与(某人)的地位(或身份等)相称(或相当)：
This sort of conduct hardly becomes a gentleman.
这种行为与绅士的身份简直不相称。
Compassionate behaviour becomes a leader.
富有同情心的行为与一名领导人的身份相称。
conduct that becomes an officer
与军官身份相称的行为

1. become用作连系动词，后面可接名词、形容词、过去分词等作表语。
　　例子：Where I had the operation,the skin has become completely desensitized.
　　我动过手术的部位，皮肤已变得完全失敏了。
　　These concepts will become clearer in the next section.
　　这些概念在下一节将变得更清楚。
　　2. become有时候可用于进行时态。
　　例子：Jack seems bent on becoming a doctor.
　　杰克似乎一心想成为一名医生。
　　It’s becoming dangerous to go out alone at night. 夜间独自外出已经越来越危险了。
　　3. become后面通常不接不定式。
　　于是我们开始喜欢她了。
　　误：Then we became to like her.
　　正：Then we began [came] to like her.
　　4.become的短语或者词组
　　become of发生;情况;发生于;降临
　　become separated分开
　　become reconciled和解;息争而归和平;和好如初;恢复和谐
　　become estranged失和;疏远;双方不再和睦相处
　　become thin落膘;成为瘦;成为薄;变薄
　　become damp发潮
　　become deaf变聋了
　　become rare变得稀少
　　become friends成为朋友;成为好朋友;成为的朋友;对待某人像朋友一样

加to
to的本意是在于哪哪哪的
必须加to