Methyl Ethyl Ketone
CAS：78-93-3
Cyclohexanone
CAS：108-94-1
Acetone
CAS：67-64-1
Acetic Acid
CAS：64-19-7
Ethyl Acetate
CAS：141-78-6
Toluene
CAS：108-88-3
Benzene
CAS：71-43-2
Ethanol
CAS：64-17-5
Methanol
CAS：67-56-1
since butanone structure
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202042 since“”“”； since“”； “” 、since since“”、 …
「since」？ since 6！
since 「 」「」. ～👇. 1️⃣ since 「」. since . ：、、、⋯⋯
How to use “since” - Common Mistakes in Business English
2017921 4. Do NOT use “since” to express present time, future time or general time. Note that in all the above examples, “since” is used to describe past time. When used to express time, “since” can ONLY be used in this way. We want the office to start operating since now, or by the end of June at the latest.
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Or maybe not, since they only keep it for one month. [1]
since()：
since：, …；…, , ；, , …；…When since introduces an action or
Since ！ |
2019819 since . since 、. Since . 1.Since . 2.Since + . 3.Since . 4.since
SINCE
since、：1. from a particular time in the past until a later time, or until now: 2. from a particular time…When since introduces an action or event at a point of time in the past, we can use the past simple or present perfect after since
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201998 since“…”,Since 、Since、
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