The phrase "a string of promises" is correct and usable in written English.
It can be used to describe a series of commitments or assurances made by someone, often implying that they may not be fulfilled.
Example: "The politician's speech was filled with a string of promises that many believed would never be kept."
Alternatives: "a series of pledges" or "a chain of commitments."
Mr Morsi has issued a string of promises meant to reassure those who distrust the Brotherhood.
In the event Mr Berlusconi comprehensively lost the first debate, on March 18th.Yet, in a rancorous final debate on April 3rd, he seized back the initiative with a string of promises to tempt the undecided.
Ever since London won the bid to host the 2012 Games on the back of a string of promises about the event's legacy, a fierce debate has raged over whether medal-winning performances in iconic stadiums could inspire the population at large to exercise more.
Along with a string of promises to buy a house in Lampedusa, build a golf course and plant trees (he has not yet done any of these), he did promise to send large ships to remove migrants to the mainland.
A string of Hope (maybe).
On the verge of the pantomime season boxing is again a laughing stock, like a tottering, rouge‑cheeked dame with a glass of sherry in one hand and a string of broken promises in the other.
If the Navajo seem unfriendly or fail to make eye contact, a park ranger told me, it is not because of 500 years of cultural genocide and a string of broken promises dating back to "hello" from Columbus.
Ten years ago, the world's leaders left the Earth Summit in Rio de Janeiro with an ambitious agenda that is mostly remembered by the participants here as a string of broken promises and squandered opportunities.
Moreover, Mr. Jeffries asserts, Mr. Green's "office is legendary for a string of broken promises to constituents, missed meetings and un-returned phone calls that have piled up on top of each other during the last 22 years".
In the six months since ousting Gov. Gray Davis from office in a historic recall election, he has broken gridlock in Sacramento and delivered on a string of campaign promises, from rescinding drivers' licenses for illegal immigrants to reversing $4 billion in car tax increases to winning public approval of a state bond issue addressing the state's vast fiscal problems.
Since ousting Mr. Davis last October, Mr. Schwarzenegger has ended years of paralysis in the California Legislature and delivered on a string of campaign promises, like winning public approval for a $15 billion bond issue and reforming the state's hugely expensive workers' compensation system.
