今夜は外食にしようって英語でなんて言うの？

Let's eat out tonight! 今夜は外食しよ！ How about eating out tonight? 今夜は外食でどう？ Why don't we eat out tonight? 今夜は外食するのはどうかな？ すべて"eat out"：外で食べる（外食する）を使いましたが、"dine out"などでも大丈夫です。 また、"Let's"はどちらかというと気持ちが決まっていて、「しようよ！」というニュアンスで、"How about〜?" "Why don't we〜？"は「〜はいかが？」と提案に近いです。 新しいレストランを試す提案をする時には、 "How about trying a new restaurant tonight?" 『今夜、新しいレストランを試すのはどう？』 と表現することもできます。

「外食する」は to dine out や to eat out などが主に使われますが、言い換え的な表現としては、get something outside も夕飯時などの会話で出てくるときがあります。 do dinner も夕飯として用いられることがあります。 参考までに（＾＾）

We normally say dinner when we eat out in the evening. In some parts of northern England, we use the term 'tea' however it is mainly known as 'dinner' - Shall we go out for tea tonight? Stating what type of food your having can be more useful as then it will let the person know what time of day and that is more specific.

There are many common expressions for this : Let's eat out tonight! Let's go to a restaurant for dinner. We can eat out tonight. I feel like eating out tonight. Why don't we go to a restaurant? Let's dine out? Shall we have dinner at a restaurant? You can use any of the above expressions to let your family know that you don't want to eat at home.

In most cases, having a family dinner at a restaurant is common. In some instances, you may hear someone say we are going out to eat or we are dining out. In America, it is known when someone says let's go out for dinner that they mean a restaurant.

You can use phrases such as "might", "may be" or "could be" to talk about possibilities of what could happen. Example: "I might go out to eat with my family."

Use these sentences above to express that you are thinking of having dinner with your family that night. Dinner with the family is a great way to relax and enjoy quality time with each other, we usually are so busy that we don't make time to spend especially with family. You may still be thinking about it and may have not yet started organizing the dinner, once you have confirmed the dinner you can say: "I have planned a dinner for my family tonight." "My family and I are having dinner tonight." "My family and I have a dinner date tonight."

"Let's go out for dinner tonight." is a suggestion that you are making to your family. You would use this phrase if you are talking to your family about the fact that you are thinking of going out with them. "I'm thinking of dining out with my family tonight." is phrased as you are talking to someone about the plans you have with your family tonight. The phrasal verbs - 'going out' and 'dining out' are the same and you can use either one you prefer to talk about having a meal at a restaurant, away from home.

If you would like to express to someone that you are thinking of taking your family out for dinner tonight, you can say something like "I am thinking of going out with my family to eat tonight." or "I'm thinking of taking my family our for dinner tonight" These are some easy ways to express this to someone.

Here are three different phrases that we can use interchangeably when telling your family that you want to eat or dine out for dinner tonight. Notice that we can use the phrase, "let's," to describe the phrase, "let us go."

Let's eat out tonight. 今日は外食しよう。 How about we go out for a family dinner tonight? 今日は家族でご飯を食べに行くと言うのはどうだ？ 上記のように英語で表現することができます。 eat out で「外食する」という意味になります。 お役に立てればうれしいです。

おっしゃられている内容は、以下のように表現できると思いました(*^_^*) Let's eat out tonight. 「今夜は外食しましょう」 あるいは、 Why don't we eat out for a change? 「気分転換に外食ませんか？」 などと言ってみても良いでしょう。 以上です。 少しでも参考になれば幸いです(*^_^*)