The phrase "a pattern that began" is correct and usable in written English.
You can use it when discussing the initiation of a recurring theme, trend, or behavior in various contexts, such as social, economic, or personal situations.
Example: "The researchers observed a pattern that began in the early 2000s, indicating a shift in consumer behavior."
Alternatives: "a trend that started" or "a cycle that commenced".
When they did go, they bought tentatively, following a pattern that began in February.
He claims to have long wanted to help others, a pattern that began in high school.
They use violence in a reasoned way, extending a pattern that began in the fall with David Cronenberg's "Eastern Promises," probably the year's bloodiest film.
It's a pattern that began just after the worst hitting streak of his career ended at 0 for 28 on Sept. 23.
That's because Lee Child's brainiac tough-guy series has been on a steady winning streak, a pattern that began three books back with "One Shot" and continues through the latest installment, "Nothing to Lose".
But, continuing a pattern that began last week, proceeds from the sales were redirected into blue-chip companies, including a number of time-tested technology names, like Intel, Hewlett-Packard and I.B.M.
On its simplest construal, the model describes a pattern that begins with an observation of instances of a generalization, includes an inference to the corresponding law (this is the inference to the best explanation), and concludes with an inference to the generalization itself or to its unobserved instances.
Recordings from the three maxillipeds on one side showed a consistent pattern that began with a compound potential in maxilliped 3, followed after a delay of 15 to 25 ms by a compound potential in maxilliped 2, and then after a similar delay by one in maxilliped 1.
A day of work on the water followed a typical pattern that began just before low tide as seals began to haul out on a tidal sandbar within Chatham harbor.
Two more people in the New York region have tested positive for cutaneous anthrax, a CBS News aide in Manhattan and a postal worker in Trenton, cases that seem to fit a broader pattern that began to emerge last week, when the first New York anthrax case was confirmed, officials said yesterday.
The cases seem to fit a broader pattern that began to become apparent last week when the first New York case was confirmed.
