modal verb + have pp / see if / by the time / look / it's clear / judging by 1. modal verb + have pp A month ago, I went Burger King and saw the menu released recently. And the clerk said to me that they was giving the buy 1 get 1 free event for promoting new menu. So, I could've purchased it right away, but I wanted to get some other menu. Therefore I bought the other. But, by the time I got back home, my mother had already bought the same menu with me. I should've bought it when I had the chance. One of my friends' computer hasn't worked since 1 week ago. I don't know why it doesn't work but I'm guessing it must've been affected by the virus. Either that, it might've had some problem caused by ransomwares. Either way, it could not've been because it has a problem on the hard drive. So, I'm going to see if what the problem is on his computer. It's because it was clear that he must've been frustrated. 2. see if I'm sorry to call you but could you see if where the items I ordered is now? I haven't gotten them since 2 weeks ago. / I'd like to apologize your inconvenience. I'll check it as soon as possible. Project Manager is supposed to see if how the project has proceeded. 3. by the time By the time I got on a bus, I noticed that I hadn't zipped my pant up. By the time My cellphone doesn't work well, the new version of the phone will be released. By the time I got to the destination, it was about 10 p.m. 4. look / it's clear / judging by On my way here, I saw a woman taking a break in the Cafe. And she is really beautiful like an angel! The best thing I've ever seen is her lovely voice. I couldn't be sure, but judging by the topic she talked with her friend and everything, she doesn't have her own boyfriend, I think.