主谓一致是指句子主语和谓语在“人称”和“数”方面保持一致，即谓语动词的形式必须随着主语人称和数的变化而变化。
[观察思考]
①Actually，the film you see on the screen is the product of a huge amount of hard work，most of which takes place behind the scenes.
②These are often added after a scene has been shot and might not be made in the way you would expect.
③Another aspect I attach great importance to is visual special effects.
④He talked to historians to ensure that the details were correct and even went down to the bottom of the Atlantic Ocean to see what was left of the ship for himself.
⑤They have worked for months and even years so that you can have two hours of enjoyment!
⑥Just as the poor passengers on the real Titanic saw the tip of the iceberg，what we see on the cinema screen is just the tip of the huge iceberg of filmmaking.
