Abstract: The ultimate goal of this paper is to provide an in-depth analysis of the frequency of the types I will, I am going to, and I am –ing within five corpora (the Corpus of Contemporary American English (1 billion, US, 1990-2019), the British National Corpus (100 million, British, 1980s-1993), the Corpus of Historical American English (400 million, US, 1810s-2000s), the Hansard Corpus (1.6 billion, British Parliament, 1800-2000), and the Time Magazine Corpus (100 million, US, 1923-2006)). The COCA clearly indicates that Americans prefer using the type I will to using the types I am going to and I am –ing in six genres except for the blog genre and magazine genre. In the other two genres, the type I am –ing is the most preferred by Americans, followed by the type I will and the type I am going to, in that order. On the other hand, the BNC clearly shows that the type I will was the most preferred by British people in three genres, whereas the type I am –ing was the most preferred by them in the other four genres. The COHA shows that the type I will was the most preferable type for Americans from 1810 to 2000, followed by the type I am –ing and the type I am going to, in that order. When it comes to the HC, it is worth noting that the type I am –ing was the most preferred by British politicians from 1800 to 2000. Americans and British people preferred talking about a new idea or something new to talking about what they have arranged to do or what they have decided to do. On the other hand, British politicians preferred talking about what they have arranged to do to talking about a new idea. As for the TMC, it is worthwhile noting that the type I am –ing was the most preferred by educated Americans from the 1920s to the 2000s. They were fond of talking about what they have arranged to do, but they were not keen on talking about what they have decided to do. Finally, it is significant to note that the type I will was the most preferable type for Americans and British people, whereas the type I am –ing was the most preferable one for educated Americans and British politicians.