使用"come across"造句如下：
Many a time have we come across this same photo. 我們多次見到過這同一張照片。
Please come across the street carefully, and you will see a hotel. 請小心地過馬路，你會看到一家旅館。
I have never come across that situation. 我從未遇到過那種情況。
I came across my teacher yesterday. 我昨天偶然遇到了我的老師。
He came across very, very well. 他給人的印象非常非常好。
I came across a group of children playing. 我碰到一群正在玩耍的小孩。
I remember having come across him somewhere in Nanjing. 我記得在南京的什麼地方（曾）遇見過你。
此外，"come across"還有提供、供給等意思，可根據語境靈活造句。