When changing direct speech to reported speech, we must not change the meaning. If someone says "I will open the door", using the future tense in their speech, at that time that person has not yet opened the door, and is indicating a prediction or intention. In reported speech, you can only write "He said that he would open the door". It does not matter what happened after the person spoke the words.

When changing direct speech to reported speech, we must not change the meaning. If someone says "I will open the door", using the future tense in their speech, at that time that person has not yet opened the door, and is uttering a prediction or intention. In reported speech, you can only write "He said that he would open the door". It does not matter what happened after the person spoke the words.

Tense changes when using reported speech