1. 我们的公司到昨天有假期。

我们公司在昨天之前都在放假。

Our company was on holiday until yesterday. 

Today we resumed our business.
3. 我要马上送给你估价单。

我会马上送给你估价单。or 我马上送个你估价单.  You use “要” when you are not 100% sure whether if you are going to do that. But as for “会” you are 100% sure. 

I am going to send you the quotation immediately.
4. 我们现在收到非常多的这个产品的订货。所以缴纳期会很长的。
We are getting so many orders of this product, so the delivery time will be long.
5. 我不会送给你回信，因为我有很长假期。

我不会给你回信，因为我有很长的假期。（如果是过去式的话 会变成“我没有能给你回信，因为我之前在放假）
I wasn't able to reply to you since I had a long holiday. 
6. 我们要用哪船舶或者飞机送这个产品？

我们要用船舶还是飞机送这个产品？
We need to send the product by vessel or air?

希望对你有所帮助。

请修改这些文章?

我们公司昨天之前都在放假。
Our company was on a holiday till yesterday.
2. 今天我们恢复营业。
Today we resumed our business.
3. 我要马上送给你估价单。

我马上给你估价单
I am going to send you the quotation immediately.
4. 我们现在收到非常多的这个产品的订货。所以缴纳期会很长的。

我们现在收到很多这个产品的订单……
We are getting so many orders of this product, so the delivery time will be long.
5. 我不会送给你回信，因为我有很长假期。

我不能给你回信……
I wasn't able to reply to you since I had a long holiday.
6. 我们要用哪船舶或者飞机送这个产品？

我们要用船舶还是飞机送这个产品？
We need to send the product by vessel or air?