
Explaining some of the everyday words in English, that are easy to confuse
Since and for
Since and for implying duration or cause
In A1 since implies duration. In A2 it implies cause:
The
meaning of since -
whether a
conjunction
,
an adverb or a preposition - is determined by the structures
and tenses
used.
Four model examples to remember:
- Duration
- Since he won the
lottery, he's become very
lazy.
or Since winning the lottery, he's become very lazy. - Cause - Since he won the lottery, he's now a millionnaire.
- Duration - I've been here since yesterday, but John's been here for five days.
- Duration - I came to London in 1990 and I've lived here ever since.
Since as a conjunction:
Model 1. Since normally implies duration (a length of time) when the verb of the since clause is in a past tense and the verb of the main clause is also in the past. Since always implies duration if the verb in the since clause is a present participle..Model
2. Since
always implies cause when the verb of
the since clause is in a
present
tense.
Since and for as prepositions.
Model 3. Since is used to situate an event in relation to a moment in time (yesterday), but for is used to relate the event to a period of time or duration (five days). The verb in the main clause is normally in the present-perfect tense.Since as an adverb.
Model 4 Since stands on its own, as in this common expression ever since: in this case it is a an adverb with the meaning "since then". Since as an adverb can never imply cause.1. Since implying time or duration :
Since is used either as a conjunction (introducing a clause) or as a preposition (introducing a phrase) , or occasionally as an adverb (standing alone).1.1. If a "since" clause implies time, it must contain a verb in a past tense.
B1
We haven't eaten anything since
we got here.
B2 We haven't eaten anything since we've been here
B3 I've been feeling sick (ever) since I ate that cake.
B4 He left home last Sunday, and hasn't been seen since.
B2 We haven't eaten anything since we've been here
B3 I've been feeling sick (ever) since I ate that cake.
B4 He left home last Sunday, and hasn't been seen since.
1.2. When the main verb in a sentence with a since clause (since you arrived) or a since phrase (since Tuesday) refers to a period of time including the present, a present perfect tense is necessary.
C1
See examples B1 - B3.
C2 I have been here since Tuesday.
C3 Since you arrived, he's been really happy.
C2 I have been here since Tuesday.
C3 Since you arrived, he's been really happy.
1.3. If the whole sentence refers to past time, the main clause.will contain a verb in the past perfect tense. The since clause generally contains a verb in the simple past tense (preterite).
D1
We
hadn't eaten anything since
we arrived.
D2 I'd been feeling sick ever since I ate that cake.
D3 I hadn't eaten anything since six o'clock.
D2 I'd been feeling sick ever since I ate that cake.
D3 I hadn't eaten anything since six o'clock.
1.4. Since always implies time if (a) it is a preposition (examples C2, D3) or (b) it is followed by a present participle (as in. since going home).
1.5. Since or for ?
Since as a preposition can only be used to express duration as from a moment in time - expressed either as an adverb (e.g. yesterday), an adverb phrase (e.g. the start of term) or a verb of action (e.g. I ate...).Since as a preposition
is never
used with a period
of time.
We cannot say: since
three hours Duration over a period
of time is
expressed with for.
E1 - moment in time: . I've
been here since last
week.
E2 - duration : I've been here for three hours.
However since
as a conjunction
can be used with either a period of time or with
a moment of time; E2 - duration : I've been here for three hours.
- if a period of time is implied (as in examples E3 and E4) , the verb in the since clause is normally in the present perfect.
- If a moment of time is indicated (as in examples E5 and E6), the verb in the since clause is in the preterite
E3. I've
felt much better since the window's been
open
E4. He's lost weight since he's started running every day
E5. I've felt much better since I opened the window.
E6. He's lost weight since he stopped eating chocolate bars.
E4. He's lost weight since he's started running every day
E5. I've felt much better since I opened the window.
E6. He's lost weight since he stopped eating chocolate bars.
Since implying cause :
1. Since must imply cause, not time, when a since clause contains a present tense,F1
Since
it is raining, we are
staying indoors.
F2 We will stay indoors since it is raining.
F3 Since he lives in Peru, he doesn't often visit us.
F2 We will stay indoors since it is raining.
F3 Since he lives in Peru, he doesn't often visit us.
2. Since normally implies cause when the verb in the main clause and in the since clause are both in the preterite (simple past ) ,
G1
I ate all the
chocolates since you left them behind.
G2 Since he was poor, he never took taxis.
To imply time, a present perfect would normally be used for the main
verb G2 Since he was poor, he never took taxis.
G11
I've
eaten all the chocolates since I got home.
3. Since, implying cause, is a subordinating conjunction synonymous with as.
Copyright : Website and texts © Linguapress.com except where otherwise indicated
Check out some more tricky words... Each or every ? Still and yet All or whole ? Enough .... and more like this
Return to Linguapress home page