The date when Dr Jonas Salk announced the effectiveness of the polio vaccine on the radio is March 26, 1953, now do you remember what I said about these images? The 1950s was a time when many great products were introduced. October 1st, 1958 is the day when NASA became operational to begin space explorations. The year when Cambridge scientist Watson and Crick discovered the chemical structure of DNA is 1953. Where is the adjective clause, I've highlighted for you where the adjective clause begins and ends. The date when Dr Jonas Salk announced the effectiveness of the polio vaccine on the radio is March 26, 1953, thanks to Dr Salk, there are almost no known cases of polio now in the US. Since then, our understanding of our place in the universe has never been the same. Thanks to these scientists, October 1st, 1958 is the date when NASA became operational to begin space explorations. Since then, we have learned so much about all living things. Pay a close attention to the use of when to form adjective clauses about time, the year when Cambridge scientists, Watson and Crick discovered the chemical structure of DNA is 1953. Now let's learn a little more about each of these events. Also, NASA was founded and the Polio Vaccine was discovered saving hundreds and thousands of children. Also the 1950s was a period in history when some very important things happened. Now I think we can all agree that these are pretty great, Now, I bet 1955 was a very exciting time for both children and adults because 1955 is the year when Disneyland opened. Now, one thing that I can say about the 1950s is that the 1950s was a time when many great products were introduced, such as the Color TV, Lego Toy, Car Seatbelt and Remote Control. Which time period do these images represent? The 1940s, the 1950s or the 1960s. Now take a look at these different images. But of course there are many other words that refer to time. Now, what type of nouns do you think when modifies? Well, time words, some examples of nouns of time include, time, season, morning, period, moment, anniversary, year, month and day. The type of adjective clause you will be learning is how to use when plus the subject and verb.
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