Only
「Only...」的標準形式是「Only+狀語+助動詞/情態動詞+主語+謂語」，屬於主謂倒裝。
「only」置於句首是一種強調倒裝，被「only」修飾的狀語可以是副詞或介詞短語或從句。
句型
◆Only by chance did I hear that Mary got married three years ago．
我是偶然聽說瑪麗三年就結婚了。
◆Only in this way can our team beat them．
只有通過這樣的方式我們才能打敗他們。
◆Only after I had seen myself did I know that there is such a beautiful wonderland on earth．
只有在親眼看見以後才能知道人間竟有這樣美麗的仙境。
◆Only when he dropped with overwork，did he ever stay at home．
他只有工作過度累倒了，才會在家休息。
—How can we maintain good relations among friends？
—Only trust each other and have a good moral character can we maintain it．
——怎樣在朋友中維持良好的關係？
——只有相互信任、有良好的道德品質才能保持。
小提示：被強調的狀語一般有三種情況：副詞、介詞短語和狀語從句。一般用「when」來引導從句。
例如：Only when his father appears，does she settle down．
只有她爸爸出現，她才會安靜下來。