probably：adv. 大概；或许；很可能 probably /ˈprɒbəblɪ/
with considerable certainty; without much doubt；easy to believe on the basis of available evidence
例句：Evangelicals in St Paul sighed that secular Democrats probably did not realise how offensive this was.
possibly：adv. 可能地；也许；大概 pos‧si‧bly /'pɒsɪbli,'pɒsəbli,ˋpɑsəblɪ/
with a possibility of becoming actual；in a manner or to a degree possible of conceiving
例句：In addition, these immigrants give birth to fewer children than their counterparts,possibly indicating cultural assimilation.
likely：adj. 很可能的；合适的；有希望的；adv. 很可能；或许 likely /ˈlaɪklɪ/
has a good chance of being the case or of coming about；likely but not certain to be or become true or real
例句：They're likely to be less mechanised, and to produce goods that command higher prices.
二个问题，三个词的使用句型
⒈接从句：It’s probable / possible / likely that… (V)
⒉用It is + V-to do句型
It is possible to do sth. (V)
It is likely to do sth. (v)
It is probable to do sth (X)
⒊接不定式：sb./sth be likely to do sth… (V)
sb. / sth be probable to do sth.… (X)
sb. / sth be possible to do sth… (X)
（注：这里sth.不指it）
⒋接不定式复合结构
It is possible for sb to do sth. (v)
It is likely for sb to do sth. (X)
It is probable for sb to do sth. (X)
probably和possibly是副词而likely是形容词。
probably和possibly的区别：
probably“十有八九的，非常可能的”指可能性很大；possibly可能性不是很大。
likely是形容词。一般用人作主语（可能性与possible差不多）。
eg：
1. He is likely to come.=It is possible that he will come.
不能用：It is likely that he will come.
第一个问题，可能性大小的比较：
依次为probable, likely，possible
possible表示客观上潜在的可能性，也许实际发生的可能性并不大。probable表示有几分根据的推测，比possible表示的可能性大。换句话说，probable的“有可能”，是指有实际的依据或逻辑上合乎情理。likely强调表面上看来有可能，与probable意思接近，有时可以互换，但likely常暗示从表面迹象来判断；probable则经过权衡正反两方面的理由后而相信某事是真实的或大概会发生
①It is possible that it will rain, but with such a blue sky it doesn’t seem probable.下雨的可能是有的，但天空一片蔚蓝，可能性似乎不大。
②His success is not impossible but hardly probable.他的成功并非是不可能的，但是希望极小。
③It is possible but not probable that it will rain.句中possible和probable的位置能否调换，为什么？如果调换意思会发生什么变化？
意思不一样
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