大懒虫杰
只有才的英语only if。
在only if中，副词only是中心词，而从属连接词if只用来连接从句，因此，它表示“只有……（才）；只有在……的时候，唯一的条件是……”的意思。
例句：
You can make progress only if you are modest.
惟虚心乃能进步。
英语if的用法
1、（表示条件）如果，主句用将来时，if从句用现在时表示将来
He will come if you invite him.
如果你请他，他会来的．
2.(表示虚拟）假如，要是
时态：可以表示过去，现在和将来的情况．它的基本特点是时态退后．
a、同现在事实相反的假设．
句型：条件从句主句
一般过去时should( would) +动词原形
If they were here,they would help you.
b.表示于过去事实相反的假设．
句型：条件从句主句
过去完成时should(would) have+过去分词
If she had worked harder,she would have succeeded.
zhuyutong215
只有。。。才能（以下的例句都以 只有努力工作才能收获丰富 为例） Only by...can...(倒装句）：Only by working hard can we harvest a lot. Only if ...can...(倒装句): Only if we work hard can we harvest a lot. 倒装句重点在 前。 only if/only by:We can harvest only if we work hard/only by working hard. but:We cannot harvest a lot but to work hard. 还有好多好多种说法。
我的歌声里AA
只有……才能……用英语表示为：Only... Can。例句1、Not only can you use tools and libraries to do this, but you almost always should. 您不但可以使用工具和库来实现这种功能，而且应该始终这样做。例句2、Not only can I do it but ( also) I can do best. 我不仅能做到而且做得最好。
黑马胖子666
1、只有……才能……用英语表示为：Only... Can。
2、只有可以用only; alone; no other than; none but表示。才能可以用ability; talent; gift; aptitude; aptness表示。
拓展资料
Only... Can的用法
1、Not only can you use tools and libraries to do this, but you almost always should.
您不但可以使用工具和库来实现这种功能，而且应该始终这样做。
2、Not only can I do it but ( also) I can do best.
我不仅能做到而且做得最好。
3、Expresses diversification Some people express a meaning, only can use one method.
有些人表达一个意思，只能用一种方法。
4、She not only can be embosomed but also can be kissed seethingly as much as you like.
不但可以紧拥入怀，还可以尽情亲吻。
5、Not only can the experiment verify the soundness of the hypothesis, IT can also improve or debunk IT.
而且，实验的过程不但可以检验其正误，往往还可能提升或推翻这个理论。
6、This is very useful because not only can it keep the Web service code concise, but also it can help to separate the Web service code from any business logic code you already have.
这很有用，因为这样不仅可以保持Web服务代码的简洁，而且有助于从已有的任何业务逻辑代码中分离出Web服务代码。
7、In conclusion, riding bicycle not only can make us healthier but also it is good for protecting our environment.
总之，骑自行车不仅能让我们更加健康，而且也有利于环境保护。
8、This way, not only can I lazy load the HTML content, I can also load the associated logic lazily.
通过这样，不仅可以延迟加载HTML内容，还可以采用延迟加载方式加载关联的逻辑。
