18 In the 1930s and 1940s, restrictions were placed on German academics. At the end of the nineteenth century, church authorities placed restrictions on academics. Following World War I, Fleming actively searched for anti-bacterial agents. b. Frasa waktu yang terkait dengan penggunaan present perfect tense: masa lalu dan kini berhubungan. Contoh: • Until recently, there has been little interest in X. • Recently, these questions have been addressed by researchers in many fields. • In recent years, researchers have investigated a variety of approaches to X but … c. Present perfect tense juga bisa digunakan untuk menjelaskan aktivitas riset atau keilmuan yang baru saja terjadi. Contoh: • Several studies have revealed that … • Previous studies of X have not dealt with … • A considerable amount of literature has been published on X. • There have been several investigations into the causes of illiteracy (Smith, 1985; Jones, 1987).
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